UPDATE: Get this as part of the Groupees Be Mine Bundle 3, while it lasts. Thanks hukd5.
Desura is currently running an extremely cheap deal for the complete Postal 2 experience - including Share The Pain and Apocalypse Weekend expansions. This controversial shooter is pretty flawed but unbelievably fun in parts - and one of the most gratuitously violent games out there. This deal will still be around after the Groupees bundle expires, just in case you miss it.