CDKeys offers Steam downloads of Rise of the Tomb Raider: 20 Year Celebration for Windows for $18.89. That's $4 under our January mention and the lowest price we've seen. (It's the best deal now by $30.) 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 cuts an extra 5% off.