I just bought Avatar for the 3rd time.

1) Theatrical Blu-ray.
2) Extended Blu-ray.
3) Theatrical 3D Blu-ray.

Stop me before I buy the Extended 3D Blu-ray. You know it's going to happen.
Then it'll be the Extended 3D Blu-ray with extra special features, then the Extended extended version, then the Extended extended extended 3D version in 4k with coupons for Sonic.