This is a shop I invented, intended for SMP servers that have protections, but not an economy plugin. The currency used is sponge blocks, where 1 sponge = 1 dollar. It uses no mods, and is fairly compact. In this example, the shop is a bakery and it allows you to buy either a cookie platter (5 cookies) for 2 sponges, or a cake for 7 sponges. You cannot buy the item unless you have entered in enough money, and buying the item subtracts the set amount of money. If you put any block that can be pulled by a sticky piston into the shop window, it gets destroyed and you gain no money. If you put in any block that cannot be pulled by a sticky piston, nothing happens. Thank you to Anthony42808 ( http://www.youtube.com/user/anthony42808?feature=g-u ) for the design for the block crusher.