Unfortunately yes, it's canceled, but you can still find plenty of it. There are a couple of threads here about the cancelation, or at least one.
Originally Posted by Nzoomed
I bought 10 rolls right away and popped them in the freezer. I'm about to buy 10 more. I really like it. Yes, it's a bit grainy but not bad for a 400 slide film. And it's less contrasty than Provia 100 and just a great film for the speed.
All the E6 films I liked are gone - Astia, E100G/Elitechrome, and now Provia 400X. I can work with Provia 100 (just shot a roll of the rebranded Precisa version) but it's a bit too contrasty and a bit too slow for my tastes. I personally rarely need or want something like Velvia though it has legions of fans. I think I'll pick up a few rolls for fall colors though.