Not for sale. Minecraft: Xbox 360 Edition was delisted from the Xbox 360 Marketplace in 2021, ahead of the full store closure in 2024.
Minecraft (Bedrock Edition) on Xbox One / Series X|S is the current version — cross-play, infinite worlds, Marketplace, regular updates. It's included with Game Pass or ~$19.99 standalone.
If you're on 360, your world is frozen in time. For the living, breathing Minecraft, you'll need newer hardware.