craftgrrl | pricing my wholesale stuff

Hi!

A general question for anyone with experience selling stuff they've purchased wholesale: Is there a "rule of thumb" I can keep in mind when pricing my stuff? I have a method in place for determining how much to charge for the things I've crafted myself, but what about the stuff I've bought wholesale? I really don't know where to begin with pricing. I thought perhaps if I spent $10 on an item, I would resell it for $20, but I'm not sure. Do you ask for double what you paid for an item, or slightly more, or even more than that? Eeep. Any info would be really appreciated.

Thanks
~A