Copied and pasted from another
thread with essentially the same question:
LT ecigs are good. They sell a good range of syringes, needles etc as well as different strengths PG/VG. They also sell their own concentrated flavours (I've tried a few and they were mostly good) and inawera concentrates (generally very good in my opinion, I have quite a few).
I
buy inawera products direct:
Inawera Shop, The Best E-Liquids, Flavours, Bases And Many More!
as well now having first tried them from LT ecigs. They also have base liquids. They come from Poland so shipping is more expensive but if you have a large enough order it works out cheaper overall (I got 9 flavours and 400ml base and it was cheaper than LT).
Chefs Vapour are excellent for concentrates of various brands, they have a huge selection. They also sell their own flavours as concentrates and although they are more expensive than most they are really good. They do sell nic, PG and VG but not mixed to various strengths/ratios so I find LT or inawera easier. The empty bottles they sell are also the best I've used.
Chefs Vapour