My bad if gog was mention here before, but if not Gog.com is a cool place to buy older games, apart from ripping out the DRM from games and selling some releases cheaper to NZ/Australian customers & I just brought Zork Grand Inquisitor for couple of dollars, compared to the same game being sold for $40 on TM! lmao.
Gog.com is where its at!
http://www.gog.com/en/catalogue