Well there don't seem to be too many breeders knocking out rare plecos. They're quite tricky, you need old, mature breeders and the low brood numbers keep prices high compared to wild caught. I saw zebra plecs at auction a week ago and they were still 350 NOK compared to 700 NOK in the shops (6 NOK to $). I have had tank bred gold nuggets, but that wasn't done for profit.
Aquabid? Ads in planetcatfish.com?