CDKeys offers Steam downloads of Rise of the Tomb Raider: 20 Year Celebration for Windows for $16.39. That's $3 under our mention from two weeks ago and the lowest price we've seen. (It's the best deal now by $33.) Beyond the base game, it includes the new "Blood Ties" DLC, all previous DLC, co-op mode, survivor mode difficulty, and in-game items and skins.

Note: New customers can provide an email address on the CDKeys Facebook page to get a unique coupon code that takes an extra 5% off.

Update: The price has increased to $18.89.