Love it or hate it (seriously, how could you?), Space Quest III: The Pirates of Pestulon is a classic parser-driven graphical adventure game, and a truly fine, funny, sci-fi, satirical, death-filled moment in the long history of Sierra. It is also the last Space Quest game designed by both the Guys From Andromeda, and, as you'd expect, a game you can buy via this Space Quest III (MS-DOS) eBay auction.
It is the excellent MS-DOS/Tandy version of the game you'll be bidding on, and it comes on both 3.5" and 5.25" disks, complete in its finely preserved box. By complete, I do of course mean the box includes the manual, the hintbook (with its "adventure window"), warranty card, Sierra catalog, punch out Death Ray Shield Mask, coupons, brochures, letters and some notes.
Seller ships to many places worldwide.