I use Vapable mainly - always very good with lots of choice, didn't find the new Wonderflavours or the Absolute Zero range very impressive but they have all the usuals plus they have Arte Italiano which I believe are Flavour Art, not super cheap but cheaper.
A litre of PG or VG use to be £9.99 but they have seen the light and is now £4.99 which is not as cheap as Lucemill or Lubrisolve probably - but isn't bad if you are shopping there anyway.
They do 100 - 10ml bottles for £24.99 - if you go to their sister site FlavourExpress they are £13.99 - afaik that's pretty good.
I didn't know there was a code, bugger... what is it ?