You can still use paypal for digital goods. Ship them a damn CD with the site contents on it and printed out screenshots of any domain transfers you did for them. Have it tracked.
Make your paypal button stress that shipment address is required and you will be sending them physical copies of the transaction, along with a back up of all files.
DO NOT just have them mail the funds to your address. Make a physical html page with what they are getting, how they are getting it, and stress the physical cd's will be shipped. If you want to really cover your ass, just make the paypal button for the physical cd.
MAKE A PAYPAL BUTTON ON THAT PAGE. If they pay with e-check do nothing till it clears.
You win that way. I've done it when selling sites.