Actually, you have to be carefull, sometimes people have their passwords hacked/stolen.
Always:
-Try and use Paypal and a credit card, COD, or online escrow (so you can reverse the charges later - a must for over $50).
-Check the feedback carefully. Is \'CDman\' with 1500 positive cd sales suddenly selling 50 $5000 TVs?
-Contact the person, because fly-by-night scammers don\'t really care enough to reply for small potatoes.
-Try to avoid using ebay for the small stuff you might be able to get elsewhere, bestbuy.com for instance, for a memcard....