If you're getting any kind of money out of the deal, that can be done via paypal. Paypal now has a new security feature where they hold the funds for like 2 weeks or something. Until you comment or get the shipment. If it's animals, then you really have no 100% sure way to get the transaction to go smoothly. I personally would never ship first, also you may be able to contact shipyourreptiles, and see if they will hold both reptiles to make sure both parties go through? I don't think they do that, but they may, it would be awesome if they would because thats a company both parties can trust.