Since Microsoft has retired the marketplace, you generally have to look toward third-party retailers for digital codes:

Content codes for non-backward-compatible games may no longer work. Always verify if a game is backward compatible before buying a specific game code. How to Redeem Your Codes

Although the 360 Marketplace is gone, the redemption system still functions through modern platforms.

Sites like CDKeys , Eneba , and G2A often carry legacy digital codes for specific 360 games or DLC.

You can still buy standard Xbox Gift Cards from the Microsoft Store or major retailers like Amazon . These add a balance to your Microsoft account which can be used for backward-compatible games.

Buying redeem codes for the Xbox 360 requires a bit of strategy now that the official Xbox 360 Store and Marketplace officially . While you can no longer buy new games directly through the console's dashboard store, you can still buy and redeem certain digital codes. Where to Buy Xbox 360 Codes