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GamersGate's Summer Sale is on for the next four weeks.
Some of the advertised prices look a bit wonky: the banner on the site says "save up to 80%", but some games are priced up to 97% off, such as, for example, the Aliens vs Predators game from 2000, which is reduced from $4.99 to $0.13. When I attempted to add that to my cart, however, it came up as costing $1.99, which seems more realistic.
This problem aside, it looks like a decent sale.
If you've not used GG before, there is no client download required, you just download the games. The only downside to GG I've found is that the games tend not to be automatically patched - they provide download links and you patch it yourself (not difficult, I'm just used to Steam doing it for me).
*** EDIT ***
It seems that some of the prices that have been reduced more than 80% do carry through to checkout. For example, Dimensity is indeed $9.99 down to $0.90, and Normality is $4.95 down to $0.31. Not sure if this is a glitch or not, but if so, these prices may change.
I found that only their daily one really worth to look at.