If you're looking for a method for payment security, you could both sign up for paypal. Then the buyer can make a charge on their credit card, and the seller will receive a check or a bank credit.
Sign up is free to both. I don't remember what the transaction fee would be (to the seller only), but I don't think it's very much. Their charts would show it.
check out
www.paypal.com
Other choices of course are a buyer's personal check, money order, bank draft (cashier's check), or traveler's checks.
Paypal is popular for auction sites or other areas where transfer of funds between two private parties is involved.
EDITED: I just looked up Paypal's fees. No fee to the buyer, and 2.9% + $0.30 to the seller.
Also, if the buyer pays by other than a credit card, then the transaction is free to both buyer and seller.