Yes they are nice. They aren't that common, but if you look around you will find them. The only Hypancistrus spp. I have seen in NZ, are Queen Arabesque Pleco's (L260), Chocolate Zebra Pleco's (L270), Snowball Pleco's (L102), what I think is L136c (it looks like the Snowball!) and rarely Zebra Pleco (L046). But you could probably order in diffrent species. They are usually around $180 each (about the same as Discus), but youcan sometimes get them for a bit less.
Another species you might like are Clown Pleco's (Panaque maccus, L104), these still aren't that common, but only cost around $50 and are eaiser to breed than Hypancistrus spp..
Cheers, CatBrat.