I bidded on Ebay for a couple of pairs of Cobra evos and won both sets. The guy selling them was selling quite a few different colours and sizes so I thought nothing iffy so paid over £700 for both pairs. I thought, play it safe and paypal with credit card - double protection. Not so. Credit card wouldn't refund because they said it was an authorised transaction and paypal only returned about 40% because, as said previously, his account was zero balance.
Lesson learnt.