Isagenix?

Where do you buy this!? My co-worker is doing it, but she said it was given to her from a friend who wasn't going to use it. The friend hasn't gotten back to her of where she got it.
I've been doing Sensa and while it's worked.. a little I think it's more my eating less than the stupid sprinkles. I'd like to do the cleanse and not use a lemon juice cayenne pepper cleanse. My co-worker has lost a total of 13 lbs and feels great.
TIA