Pixelpiper
Super Freak
But PayPal is the only acceptable payment method for ebay.
It's the preferred, as eBay owns PayPal, but they allow competing services as well (there would be some antitrust questions if they didn't). Money orders and other forms such as checks have restricted categories, and this auction isn't in one of them - but that's up to eBay to take down the auction if someone complains. If the seller says he'll refuse PayPal, then expecting them to accept your payment is kind of naive.