Bukkit

If you don't answer these questions, your ticket will be DECLINED. You may remove this line.

What steps will reproduce the problem?
1.simply sell and buy items in the same command for the same showcase
2.
3.

What is the expected output? What do you see instead?
currently you can only sell OR buy stuff with a showcase

What SCS version are you using? We don't accept "latest"!
616

Do you have an error log of what happened?
no error log needed

Please provide any additional information below
this is very handy for spawnshops to crop the size of the market because now it takes for 64 items 128 shops. it can be 64

I don't know how to realize this with the limited amount of controls.
How would you like to interact with such a shop?

Btw, an ExchangeShop does not fit your desire?

Also would like this added.

No, exchange shops are for exchanging items. We want to be able to set a price to BUY the item and a price to SELL the item in the same shop. Say if a player left clicks the shop they can buy 10 diamonds for $100, or right click it to sell 10 diamonds for $50.