Amazon is still doing expanded Holiday Deals.
Even better than that, Steam is having a Holiday Sale. Now through December 31, you can get “gifts” or coal from steam for completing achievements. The gifts can be coupons or full games, additionally, the coal can be traded in for more gifts or further entries into a giveaway.
Lastly, Microsoft is doing 12 Days of Xbox Deals (more info here).
Merry Christmas and get onto Steam!