modularised ball vendor

misc/ball_vendor.gd

@@ -0,0 +1,16 @@
+extends Node2D
+
+@export_group("Starting Prices")
+@export_range(1, 1000) var _basic_ball: int
+@export_range(1, 1000) var _speed_ball: int
+
+@onready var _price_basic_current = _basic_ball
+@onready var _price_speed_current = _speed_ball
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass # Replace with function body.
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta):
+	pass

misc/signal_bus.gd

@@ -0,0 +1,3 @@
+extends Node
+
+signal on_try_buy_ball(id: int)