Payment By PayPal
i use PayPal to protection against fraud
Or you could use Bitcoin and escrow to actually protect yourself against fraud.
Good luck - not sure many users here will want to use Paypal. How do you plan to protect the seller from fraud?
I hade many horrible story when I baying by Bitcoin , they run away . I used PayPal my Own account , ant they send the machine under same Name PayPal account , not different name , or if the seller need any proof I can arrange .