Like Ehsan said, PayPal is fine "If its under $100 and the the member is a verified by paypal". While PayPal will not protect you like Escrow.com would, but the Escrow fees on a low value domain would greatly increase the purchase price. For a low value domain, those services are just too expensive. Make sure they are at lease PayPal certified, better yet look at their iTrader rating if they sell on DNForum. Just my two cents.