I got all my minis on ebay, except for a few, and had only one small problem: they sent me a luke ESB for a luke ANH, which was ok cause i didnt have that one neither 8)
I once got two minisabers for $6 + shipping!!!! that was a great deal!
anyway as princess Leia said, you take chances when buying from ebay, but still you can buy from powersellers on ebay which are actually stores and you reduce the risk a lot.
Welcome to the forum GoldLdr, hope you enjoy it here. ;)