I've purchased a few items through SF and even a pair of rare Alden's from a fellow forum member here. That being said, its always good to be cautious. I recommend going through Paypal and sending the money as goods with an exact description of what the goods are. There's a fee associated which the seller may pass on (2.9% or so), but look at it as an insurance policy. Furthermore, have the seller invoice you in that way. Check if he's a verified seller, etc.