This is the cheapest I've seen it. I'm looking for the 360 version unfortunately though, which is still £34.85.
4% Quidco too.
Apparently same price on 360 now (thanks to saveoneformetoo!), shopto site is down at the moment though.
Edit: 360 version is still £34.85, so changed the title back again!
It's now £32.85 - still the cheapest though.