£99 for Kindle Fire is very good value. That's the one with full Android operating system - full web access etc. I've been watching the Argos Home Shopping Channel and IdealWorld and the DealChannel. They've all been demonstrating lots of these models, every night.
The model these channels were pushing most heavily over the weekend was the JoyTab, with a separate keyboard, for £199, I think. Though the ones they push tend to be those where they have stock they want to move.
CatchUP TV is a cool app. It's like iplayer, but also covers lots of non-BBC channels too.