http://www.gamesas.com/topic/1396555-game-sales-and-deals-steam-gog-gamersgate-impulse-desura-etc/.

This thread is for the discussion of gaming deals found on http://store.steampowered.com/, http://www.gog.com/, http://impulsedriven.com/, http://www.desura.com/, and other sites or stores.

See also the http://www.gamesas.com/index.php?/topic/1226409-unofficial-is-insert-game-here-any-good/, for advice on games you're considering.

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Steam is currently having a summer sale, in which much of their range is discounted all the way through to the 24th, and each day certain titles will be discounted even further. This year there are also flash sales, which last ~eight hours each. Veterans recommend waiting to see if the games you want get offered in a daily deal or flash sale (if they do, pick 'em up then), and on the last day buy any that haven't.

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Today's Deals

http://store.steampowered.com/sub/15387/
http://store.steampowered.com/sale/summer2012_witcher?snr=1_4_4__sdd
http://store.steampowered.com/app/63380/?snr=1_4_4__sdd
http://store.steampowered.com/sub/15375?snr=1_4_4__sdd
http://store.steampowered.com/app/3590/?snr=1_4_4__sdd
http://store.steampowered.com/app/42170/?snr=1_4_4__sdd
http://store.steampowered.com/app/42170/?snr=1_4_4__sdd
http://store.steampowered.com/app/57300/?snr=1_4_4__sdd
http://store.steampowered.com/app/22380/?snr=1_7_suggest__13

Flash Sales
http://store.steampowered.com/app/201830/?snr=1_4_4__sfs ends in 4 hours
http://store.steampowered.com/app/91700/?snr=1_4_4__sfs ends in 6 hours
http://store.steampowered.com/app/550/
http://store.steampowered.com/app/96800/?snr=1_4_4__sfs ends in 12 hours


Community Choice
http://store.steampowered.com/app/6310/ ends in 6 hours

Ugh, the Total War Megapack is very, very tempting, but I've decided to be patient and look for ArmA.
If that game never goes below 20%, I'll flip.

Hmm, Amnesia: The Dark Descent for 3,74€? Why do Steam tempt me so?

Son of a [censored], I just bought Thief 1 and 2 for $12 yesterday.

Well, I don't have Thief 3 on Steam yet, and it's $2.50..so I didn't completely miss my chance at a good discount.