Ok im listing the items between $0 and $250 to help out people who just started.

ITEM LIST

Sunlight
Cost: $0
Provides: (well nothing...)

Screen Protecter
Cost: $100
Provides: +1 battery max

Slice of pizza
Cost: $100
Provides: +1 caffeine

Can of red bull
Cost: $180
Provides: +2 caffeine max

Usb charger
Cost: $180
Provides: +2 battery max

Car charger
Cost: $250
Provides: +3 battery max

Starbucks frappucino
Cost: $250
Provides: +3 caffeine max

Well thats part 1 next i will explain more complex items.