a coffee grinder (or 'budbuster 2000' as it is sometimes known) is a great way to collect crystals as well as bust up your shit...I've got a portable one, takes 2 AA batteries, and works wonderfully. but you're not trying to make your weed into powder...that's too much busting. you want it crumbly, but enough that you can pinch it and pick up a small bunch between your fingers...