Sounds like you did really well then chick!
Yeh I havnt tried it yet but a couple of the girls I speak to in the ww forum have started insanity and you need to check your heart rate at various points.
You can pick them up from a fiver but the really cheap ones tend to have really bad reviews saying they are pretty useless. Ordered one from eBay yesterday, not here yet so no idea of its any good but it's a branded one and was only £7.99 with free delivery! X