I found a used MacBook on craigslist and I'm going to go look at it this week. I have a few questions... can you get AppleCare without the receipt as long as it's within a year of the purchase using the Serial Number? And... any things I should be on the lookout for? It's a base MacBook... 2.0GHz Intel C2D, 80GB hard drive, 1GB ram, etc, etc... It was purchased in august... she wants 900 for it, is that a fair price? Let me know your thoughts! Thanks!