Microsoft offers Xbox Live Gold members downloads of Rise of the Tomb Raider Season Pass for Xbox One for $7.50. That's the lowest price we could find by $22. The base game is required to play this content.
Also available for Xbox Live Gold members are downloads of Rise of the Tomb Raider for Xbox One for $20. (Techworld via Walmart and Amazon—exclusively for Prime members—have it for the same price.) That's tied with our mention from last month and $5 under the best deal we could find for a physical copy elsewhere.