The white ones came in a bunch I "rescued' from a
LFS that was keeping them in awful conditions. They were all the same price. Hillstreams are in general not easy to find but will occasionally show under incorrect names such as Hong Kong pleco, Butterfly pleco, Sting Ray pleco and various other names. They are not a pleco in any way. They graze on algae just to get the little critters(aufwachs) growing in the algae but they don't eat algae. They do have special tank and temperature needs. Hope that helps.
Carol