I use LT Ecigs
Service is spot on. First time I used them I was notified before ordering of a slight delay due to bank holiday but every time since its always under 48 hours from ordering. Flavours bases and wick/wire.
Mods attys etc. Worth a look.
All of the suggestions above are good sources but be careful if you decide to go elsewhere if you find them cheaper..
I've bought a few dirt cheap but I'm almost certain they were diluted before they sent them.. They were nowhere near as strong as the ones I've purchased from the above sites.