diff --git a/src/ects.py b/src/ects.py
index e746c12..ea9319d 100644
--- a/src/ects.py
+++ b/src/ects.py
@@ -2,6 +2,7 @@ import pygame
 
 from src.settings import START_ECTS_VALUE, ECTS_UPDATE_INTERVAL
 
+
 class ECTS:
     def __init__(self):
         # total amount of ECTS the player has at the beginning
@@ -24,3 +25,9 @@ class ECTS:
     # beer increases amount of how much ECTS are earned per second
     def upgrade_rate(self, extra_ects):
         self.ects_per_second += extra_ects
+
+    def is_over_balance(self, amount):
+        return self.ects_balance >= amount
+
+    def decrease_balance(self, amount):
+        self.ects_balance -= amount
diff --git a/src/game.py b/src/game.py
index 4425c6e..9821754 100644
--- a/src/game.py
+++ b/src/game.py
@@ -74,7 +74,6 @@ class Game:
                 self.update(dt)
                 self.draw()
 
-
             pygame.display.flip()
             frame_count += 1
 
@@ -144,8 +143,6 @@ class Game:
         self.screen.fill(color_void)
         self.map.draw_map(self.screen, self.font)
 
-
         # Draw by Y position so actors lower on the map appear in front.
         for actor in sorted([self.player], key=lambda item: item.position.y):
             actor.draw(self.screen)
-
diff --git a/src/item.py b/src/item.py
index e0cec9e..09be957 100644
--- a/src/item.py
+++ b/src/item.py
@@ -11,6 +11,7 @@ class Item:
         self.x = x
         self.y = y
         self.item_type = item_type
+        self.cost = random.randint(5, 10)
 
         # collision rect for player (2 times item size for width and height)
         self.rect = pygame.Rect(self.x, self.y, ITEM_SIZE, ITEM_SIZE)
@@ -50,6 +51,9 @@ class Item:
             pygame.draw.rect(screen, color, draw_rect)
             pygame.draw.rect(screen, COLOR_HP_BAR_BG, draw_rect, 2)
 
+    def get_cost(self):
+        return self.cost
+
 
 # try 50 times to find a free position to spawn item
 def _random_position(room_rect, blocked_rects):
@@ -130,4 +134,4 @@ class ItemManager:
     # clear items when changing room
     def clear(self):
         self.items = []
-        self.last_spawn_time = pygame.time.get_ticks()
\ No newline at end of file
+        self.last_spawn_time = pygame.time.get_ticks()
diff --git a/src/map.py b/src/map.py
index 20420ff..ac4ea39 100644
--- a/src/map.py
+++ b/src/map.py
@@ -1,9 +1,8 @@
 import pygame
 from src.desk import Desk
-from src.settings import DESK_WIDTH, DESK_HEIGHT
+from src.settings import DESK_WIDTH, DESK_HEIGHT, tile_size
 
-# Fenstergröße und Tile Größe (Felder)
-tile_size = 30
+# Fenstergröße
 screen_w = 1900
 screen_h = 900
 
diff --git a/src/settings.py b/src/settings.py
index fb68e0a..cfb8c5d 100644
--- a/src/settings.py
+++ b/src/settings.py
@@ -1,6 +1,7 @@
 from typing import Mapping, Literal, Tuple
 
-from src.map import tile_size
+# Fenstergröße und Tile Größe (Felder)
+tile_size = 30
 
 # --- DESK ---
 DESK_WIDTH = 70
diff --git a/src/shop.py b/src/shop.py
new file mode 100644
index 0000000..f0a13eb
--- /dev/null
+++ b/src/shop.py
@@ -0,0 +1,30 @@
+from src.item import Item
+
+
+class Shop:
+    def __init__(self, ects, buyable_items):
+        self.ects = ects  # give the ects object to the shop
+        self.buyable_items: list[Item] = buyable_items
+
+    def buy(self, item_name):
+        item_to_buy = self.get_item(item_name)
+        if item_to_buy is None:
+            return False
+
+        cost = item_to_buy.get_cost()
+
+        # is_over_balance() means "has enough balance"
+        if not self.ects.is_over_balance(cost):
+            return False
+
+        self.ects.decrease_balance(cost)
+        return True
+
+    def get_item(self, item_name):
+        for item in self.buyable_items:
+            if item.item_type == item_name:
+                return item
+        return None
+
+    def get_items(self):
+        return self.buyable_items