This week Steam is running a promotion on 2K Games with a different deal going up each day. Today's deal features all Mafia games at 75% off. Discount lasts until 10am PST, Tuesday.

Check back tomorrow when the next deal will be posted.

For today only ImpulseDriven.com is offering Machinarium, an indie puzzle game set in a completely robotic world, for $5.

The daily deal at Amazon is a cheap price on two classic PC games, Civilization IV and Civilization V. Civ V is marked down to $29.99 ($20 of savings), and Civ IV is marked down to $22.99 ($17 of savings). This deal is for the PC downloadable versions.

Until the end of the month Amazon is selling Xbox 360 Accessories at a discount.  The deal includes controllers (even the new one with the configurable d-pad), as well as headsets and chargers. Follow the purchase link to see a full list and prices.

The code you will need is B2G1PSS.

This is part of the GameStop Power Saver sale, and only good for this weekend only. If you buy 3 pre-owned games, you'll get the cheapest one free.