Trading Machine

There are 3 levels of Trading Machines. Each
Machine has Trade Offers for 6 Levels of Traders.
Buys your Commodities at 100 a piece.
Trades Commodities at different Rates:
Cheap are 50 or 75 per 1
Normal is 100 per piece
Expensive is over 100 (150, 200 250 for 1)
Buy and Trade Cheap; Sell when you want.