Those crazy guys and girls over at Valve are at it again, and have drastically reduced the prices of both Left for Dead as well as Left 4 Dead 2, from $19.99 each to just $6.79 (R47) each.
If you are feeling particularly keen on increasing your daily dose of zombie blasting, you can get them both for $10.19 (R70).
Both games received critical acclaim, and were praised in particular for their ridiculously fun co-operative elements.
The midweek madness does not end there though, and Valve is also selling both Modern Warfare 2 DLC packs for half price. You can now pick up the Stimulus pack and the Resurgence pack for $7.49 (R52). Each pack adds a handful of new maps, as well as some reworked Call of Duty 4 maps.
There is heaps more DLC currently on sale on Steam this week, so be sure to browse through their Specials catalogue.