Hmm, what about an Apple II Plus. I am seling a monitor, two disk drives and the machine itself for 500 bucks and planing to buy this one;

http://www.ebay.co.uk/itm/TRES-RARE-ORDINATEUR-APPLE-II-2-EUROPLUS-CARTES-1979-TRES-BON-ETAT-/351336658613?pt=LH_DefaultDomain_71&hash=item51cd4bf6b5