about the same as pcworld's prices really, its been a while since ive shopped there but they tend to do some good deals and bundles every so often. its about what i would expect from a reasonable high street store but it doesn't really compete with online prices
Maplin certainly don't specialise on pc parts. But you should see their in-store catalogue. It makes Argos pale into insignificance and it's all electronics-based. I buy audio equipment and cables from them, and they've got some cool thegadgetshop - type gadgets.
If you're looking for pc parts, though, stick with the likes of pc world is my advice.