I went to my local Asda last night and they had an elliptical strider reduced from £90 down to £40. I've had a go on it and it's a really nice way to exercise with no strain on the knees, it also shows how fast you're going, time, distance & calories burnt.
They also have other items - exercise bike £20, treadmill £50, side stepper £15, trampoline £10! They are by Star Shaper - might be worth ringing first to see what they have in stock.
Worth a look if you're to skint/lazy to join a gym like me