I'm going to upgrade my Mac mini's RAM soon from 256MB to either 512MB or 1GB, but the problem is I can't open the computer myself, and I'm afraid of what'll happen if I used the putty knife method. So I want to upgrade. Apparantly, the Apple Stores don't do so (it's not an option on their memory upgrade site last I checked) so I turn to CompUSA. If they do offer it, is the service cheap and reliable?