diff --git a/Cargo.lock b/Cargo.lock
index ea17b2c..53004ae 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,6 +37,7 @@ dependencies = [
  "console_error_panic_hook",
  "getrandom",
  "indoc",
+ "maplit",
  "pretty_assertions",
  "reqwest",
  "scraper",
@@ -631,6 +632,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
+[[package]]
+name = "maplit"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
+
 [[package]]
 name = "markup5ever"
 version = "0.11.0"
diff --git a/Cargo.toml b/Cargo.toml
index dca90bd..fb45c15 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,6 +25,7 @@ reqwest = "0.12.5"
 
 [dev-dependencies]
 pretty_assertions = "1.4.0"
+maplit = "1.0.2"
 
 [package.metadata.cargo-machete]
 ignored = ["getrandom"]
diff --git a/README.md b/README.md
index 3896fdb..2470e8d 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,10 @@
 - `NTFY_URL` - URL for ntfy
 - `SLACK_GROUP_ID` - ID of the Slack group to ping
 
+## Key-value keys
+- `real_prices` - stores the real-world prices of items. equivalent to a `HashMap<String, i32>`, where `String` is the `id` parameter. prices are in USD.
+- `items` - stores old items (you don't need to worry about this one)
+
 ## Tech Stack
 - **Cloudflare Workers** for running the monitor on the edge.
 - **Rust** for the monitor's code. I love its type safety, as well as libraries such as `serde`.
diff --git a/src/format.rs b/src/format.rs
index 776f734..00ebf1b 100644
--- a/src/format.rs
+++ b/src/format.rs
@@ -3,7 +3,11 @@ use serde_json::json;
 
 use crate::items::ShopItem;
 
-pub fn format_item_diff(old: &ShopItem, new: &ShopItem) -> Option<String> {
+pub fn format_item_diff(
+    old: &ShopItem,
+    new: &ShopItem,
+    real_price: Option<&i32>,
+) -> Option<String> {
     if old == new {
         // The items are the exact same
         return None;
@@ -19,13 +23,21 @@ pub fn format_item_diff(old: &ShopItem, new: &ShopItem) -> Option<String> {
 
     if old.price != new.price {
         result.push(format!(
-            "*Price:* {} → {} {}",
+            "*Price:* {} → {} {}{}",
             old.price,
             new.price,
             if old.price > new.price {
                 "🔽"
             } else {
                 "🔼"
+            },
+            if let Some(real_price) = real_price {
+                format!(
+                    " _(${real_price} - ${}/hr)_",
+                    (*real_price as f32) / (new.price as f32)
+                )
+            } else {
+                "".into()
             }
         ));
     }
@@ -257,21 +269,23 @@ mod diff_tests {
         let old = ShopItem {
             full_name: "Test".into(),
             price: 1,
+            id: "1".into(),
             ..Default::default()
         };
 
         let new = ShopItem {
             full_name: "Test".into(),
             price: 2,
+            id: "1".into(),
             ..Default::default()
         };
 
         assert_eq!(
-            format_item_diff(&old, &new),
+            format_item_diff(&old, &new, Some(&50)), // Let's say it's $50
             Some(
                 indoc! {"
                 *Name:* Test
-                *Price:* 1 → 2 🔼"}
+                *Price:* 1 → 2 🔼 _($50 - $25/hr)_"}
                 .into()
             )
         );
@@ -282,17 +296,19 @@ mod diff_tests {
         let old = ShopItem {
             full_name: "Test".into(),
             description: Some("Lorem ipsum".into()),
+            price: 2,
             ..Default::default()
         };
 
         let new = ShopItem {
             full_name: "Test".into(),
             description: Some("Dolor sit amet".into()),
+            price: 2,
             ..Default::default()
         };
 
         assert_eq!(
-            format_item_diff(&old, &new),
+            format_item_diff(&old, &new, Some(&50)),
             Some(
                 indoc! {"
                 *Name:* Test
@@ -317,7 +333,7 @@ mod diff_tests {
         };
 
         assert_eq!(
-            format_item_diff(&old, &new),
+            format_item_diff(&old, &new, Some(&50)),
             Some(
                 indoc! {"
                 *Name:* Test
@@ -332,17 +348,19 @@ mod diff_tests {
         let old = ShopItem {
             full_name: "Test".into(),
             stock: Some(10),
+            price: 2,
             ..Default::default()
         };
 
         let new = ShopItem {
             full_name: "Test".into(),
             stock: None,
+            price: 2,
             ..Default::default()
         };
 
         assert_eq!(
-            format_item_diff(&old, &new),
+            format_item_diff(&old, &new, Some(&50)),
             Some(
                 indoc! {"
                 *Name:* Test
@@ -367,7 +385,7 @@ mod diff_tests {
         };
 
         assert_eq!(
-            format_item_diff(&old, &new),
+            format_item_diff(&old, &new, Some(&50)),
             Some(
                 indoc! {"
                 *Name:* Test
@@ -392,7 +410,7 @@ mod diff_tests {
         };
 
         assert_eq!(
-            format_item_diff(&old, &new),
+            format_item_diff(&old, &new, Some(&50)),
             Some(
                 indoc! {"
                 *Name:* Test
@@ -410,6 +428,6 @@ mod diff_tests {
             ..Default::default()
         };
 
-        assert_eq!(format_item_diff(&item, &item), None);
+        assert_eq!(format_item_diff(&item, &item, Some(&50)), None);
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index fc3e54f..6993df3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,5 @@
+use std::collections::HashMap;
+
 use items::ShopItems;
 use reqwest::Client;
 use worker::*;
@@ -48,9 +50,13 @@ async fn run_scrape(env: Env) -> Result<String> {
         kv.put("items", &available_items)?.execute().await?;
         return Ok("No old items found, storing new items".into());
     };
+    let Some(real_prices) = kv.get("real_prices").json::<HashMap<String, i32>>().await? else {
+        console_debug!("No real prices found!");
+        return Err("No real prices found! This is a bug.".into());
+    };
 
     // Compare the old items with the new items.
-    let result = diff_old_new_items(&old_items, &available_items);
+    let result = diff_old_new_items(&old_items, &available_items, real_prices);
 
     // Check if there are any updates.
     if result.is_empty() {
@@ -89,7 +95,11 @@ async fn run_scrape(env: Env) -> Result<String> {
     Ok(result.join("\n\n"))
 }
 
-fn diff_old_new_items(old_items: &ShopItems, new_items: &ShopItems) -> Vec<String> {
+fn diff_old_new_items(
+    old_items: &ShopItems,
+    new_items: &ShopItems,
+    real_prices: HashMap<String, i32>,
+) -> Vec<String> {
     let mut result: Vec<String> = Vec::new();
     for item in new_items {
         // TODO: not very efficient.
@@ -97,7 +107,7 @@ fn diff_old_new_items(old_items: &ShopItems, new_items: &ShopItems) -> Vec<Strin
 
         match old_item {
             Some(old) => {
-                if let Some(diff) = format::format_item_diff(old, item) {
+                if let Some(diff) = format::format_item_diff(old, item, real_prices.get(&item.id)) {
                     result.push(diff);
                 }
             }
@@ -123,6 +133,7 @@ mod diff_old_new_items_tests {
 
     use indoc::formatdoc;
     use items::ShopItem;
+    use maplit::hashmap;
     use pretty_assertions::assert_eq;
 
     #[test]
@@ -130,12 +141,14 @@ mod diff_old_new_items_tests {
         let item_1 = ShopItem {
             full_name: "Item 1".into(),
             description: Some("Description 1".into()),
+            price: 200,
             id: "1".into(),
             ..Default::default()
         };
         let item_2 = ShopItem {
             full_name: "Item 2".into(),
             description: Some("Description 2".into()),
+            price: 50,
             id: "2".into(),
             ..Default::default()
         };
@@ -143,7 +156,14 @@ mod diff_old_new_items_tests {
         let old_items = vec![item_1.clone(), item_2.clone()];
         let new_items = vec![item_1.clone()];
 
-        let result = diff_old_new_items(&old_items, &new_items);
+        let result = diff_old_new_items(
+            &old_items,
+            &new_items,
+            hashmap! {
+                "1".into() => 100,
+                "2".into() => 200,
+            },
+        );
 
         assert_eq!(result.len(), 1);
         assert_eq!(