This Atari ST auction, apparently, comes complete with everything you need in order to spend a couple hundred hours gaming the 16-bit way. It's comes with a properly boxed Atari 520 STfm with all the required bits and pieces to set the thing up, a mouse, over 70 games on over 70 disks, more than a few boxed games and some extra software. Seller ships only within the UK.
From what can be seen on the photos you will, among others, be getting Fast BASIC, R-Type II, Zork, Turrican, Oh No! More Lemmings and Weird Dreams.