Powerskip fun!

Hey all,
One day a week i go to the local high school and teach circus arts to lots of enthusiastic and talented kids. One of the main payoffs is that i get to teach people to unicycle (who i can then ride with later on when they get better and into trials/muni etc) but perhaps more inportantly play with all their cool toys. They just got these powerskip sprung stilts in a week ago and i got to play with them for the first time this afternoon and all i can say is…YAHOOOOOOOO!
When i get more comfortable with them i will try some tumbling lines etc (on the net i have seen people do roundof, back flip, back flip, back flip full twist- i can do all these on a trampoline but with heavy boots on i’m not confident)
I wonder after spending some time on them wether or not you could perform a kind of pseudo parkour with powerisers? (even though the whole deal with parkour is that it requires no equipment)
Here are some pics

Ive seen these a long time ago, like 5 years ago, and ever since i wanted one, but forgot, know you reminded me aobut them =))

So, do you know info on them? where to buy? how much? i want some so badly, also i saw you can run on them really well =p

i just saw some of these, on a nascar tv thing they looked super cool