Does anyone know when they will release any of the Crocodile Hunter Complete series?

I'm a huge Steve Irwin fan and would love to own all the series. But I cant find the complete series for the shows, "The Crocodile Hunter" "Croc Hunter Diaries" and "Croc Files." Or any others. I know they have some not near of the all of them; but there sold individually. So does anyone know where I can find THE COMPLETE SERIES; and if not do you know when they might come out.