The A320 has been out of stock for a long time, it's no longer manufactured for a couple years at least. At this point you'll only be able to find one used.
There are quite a few places still selling the A330 though, which is really an A320 with more memory and a PSP lookalike case. I'm toying with the idea of buying one myself, so I can have a fallback when my A320 dies (the battery is already not performing too well, and I couldn't find any places that sells the battery so I could replace it)