Is the iPhone XS Max still available?

Since it has been discontinued by Apple, you will have a difficult time trying to find one. If you do, it most likely will be a second hand phone. I would suggest looking at the current phones offered by Apple.

It is Discountinued by Apple, from Apple you will find Refurbished ones for $799.00 Unlocked, check online or in some retail store you can get good deals for used or may be non-active models.

That model has been discontinued by Apple.