These are almost always dropshippers using stolen credit cards or stolen gift cards. You'll get the product, the thief will get the money, and the victim will have to dispute the charge.
I've actually purchased two "too good to be true" listings in the past. Both times my delivery name was chopped up on the invoice, and the buyer name was much different than the person who received the payment in PayPal. Both times I called the store after about a week and both charges had been disputed. Barnes and noble sent me a return label and I shipped it back, and disputed on eBay and let them know it was purchased with a stolen credit card using the email trail from B&N as proof. The second was from Target. They told me to keep the item, but let me know had I not reported it my address may have been flagged as using stolen cards, and they may have banned my address from all future deliveries.
Tread carefully