My buddy runs an online ebay collector toy store. Buys and sells lots, will also sell your stuff for a commision.
I just tell him what I want and let him take care of it. If all you do is buy stuff at garage sales or second hand stores and you know what to buy you can make some real money on there. He doesnt make as much as me, but he writes most of his stuff and expendetures off.
CMNGT*s good for some protection if you are a buyer, but if you are a seller they can screw you over. My buddy requires a deposit through payapl so its immediate but the rest of the payment must be by a bank cheque