Check out one of the monthly mags such as Coarse Fisherman or one of the carp mags. They are usually full of adverts from different shops, so you should be able to get an idea of what is a current good price.
Richard,
Fosters of Brum will do you a good deal for the easy dome, ....good bit of kit bytheway,they are up in no time and they will fit into swims that the big bivvy boys have to pass!!
Hello Richard - I have just bought a Fox Classic Easy Done from 'Exchange Angling', they might not be the cheepest, but their service was second to none (imo).
Take a look here: