There are plenty of Gen 3 offers online, not that I would ever buy one more expensive than Tesla sells it for. It goes in and our of stock but if you wait a few days you will find it a the Tesla website.
The Y comes with a Gen 2 UMC, but now it only comes with the 120V adapter. If you have a 240V outlet in your garage, buy the the Gen 2 adapter for the outlet you have. If you don't have one, and are going to install one, the best one to install is the 14-50.