depends on if you know exactly what you want or need advice.
If you know what you're after then just google as different shops often have special offers on. Field and trek have some climbing stuff in sale at moment but quite a limited choice, lots of other shops often have offers or deals on eg Rock and Run, V12, joe browns, Climbers shop, lakes climber, Needlesports.
If you need advice on choosing then one of the best places (imho) is needlesports
DMM prowire quickdraws good value at needlesports, if its 50m single rope you're after then Beal edlinger 2 at needlesports (good starter rope, handles nicely) . For half ropes i like the Beal Cobra 8.6, handles really well. Cheapest place i think after a quick google for a cobra is Facewest. Some people swear by mammut ropes though. Plenty of choice. Good starting site for info is Needlesports