I believe there is 22 episodes and there is no US version of the DVD's. You can find them on the UK Amazon.com but you would need a region-free DVD player to watch them.

Someone did say that they would come out in the US within a year, but I doubt it. The series has been off the air for sometime now and if the DVD's have not been created yet, I doubt they will. More likely the series might be re-aired as reruns when the third movie comes out.