Our fish store gets them in fairly often. They go by Stingray Pleco there. We had one, but it ended up croaking after a few months, and it never did really grow. :/
What you're seeing looks like a beaufortia kweichowensis. I've had mine for about 2 years. Keep them in a highly aerated, coldwater, high flow river tank. A 20g long is a good start.