These usually RRP for around £120.00 but John Lewis have price-matched this (not sure where it's been matched to) which is a great price for a product which actually appears to work!
I know, it sounds too good to be true, but I spent all last night researching these and couldn't find a bad word said. They genuinely do appear to be effective.
There are also systems for your rear and arms. Bottom systems also price matched. A good buy for some last-minute toning for your holiday (or in my case, some post-holiday recovery!).