Infocom's 1993 release Return to Zork will cost you $5.99 and just think--due to the magic of digital distribution, you won't have to scrimp and save for a CD-ROM drive to play! Though your 14,400bps modem might take a while to download it. A big bundle of earlier, text-driven Zork games hit GOG earlier this month, also for $5.99.
Elemental's 2006 sci-fi sim-strategy-shooter-RPG Space Rangers 2, meanwhile, is priced at $9.99. That extra $4 is for the privilege of not having to watch hammy acting.