Need help with a macro.

[Crypted]

Hey, I need some help with creating a macro that will buy things automattically, and not that other duping macro, just a basic one. The server that i'm playing on fixed that dupe macro so items can't stack like that, but there's still an item that you can sell for more than you can buy, and I got a selling macro. All I need is a buying one, that buys a lot of stacks at a time, around 50, the item is Doomshot.