Back/Lumbar supports..any cheap bargains out there?

[Desperate Housewife]

I am looking to get a lumbar support as i get backache every so often and there seems to be lots to choose from out there at all different prices. I wonder if anyone has come across any bargains for a good quality one they can recommend please?

I saw a couple in argos around £15 price range and thought they might be good.

Any advice much appreciated :)