Buy Preview Shop

This is what the Buy Preview page looks like.

The grass block is the item that is being bought. The lime stained glass pane is where you add to the amount of an item you want to buy (you can buy up to 64 of an item at a time). The red stained glass pane is where you remove from the amount of an item you want to buy.

You can change the format of what the "cost: $x" looks like in the config.