the information I was given when I asked about them at the LFS is that they're endangered so not being imported now I believe. You'll be very lucky to find any and if you do they'll be very expensive.
Occassionally I've seen one or two come up on ebay from breeders who have 1 spare.
Also, be sure you are getting the fish from a legitimate source. There are very few places that are succesfully breeding this species. You will find plenty of people selling them at crazy prices and usually those are the smuggled ones. The Brazilian Government placed a ban on the export of those fish in recent years.