UK Sources for supplements and herbs?

Hi guys,
Im interesting in finding cheaper sources for some of the supplements I take as I cant stand having to buy things at Holland and Barratt. In the US things like ascorbic acid (vit C) even in buffered forms is very, very cheap! But over here you cant get it for anything. Does anyone have any good places they go to get cheaper supplements?

I use nutricentre, food for living and goodness direct often. The Kefir Shop is very good for kefir (obv) and some dried herbs. I also ebay from the US. I think they really do get much better food supplements over there.

Any ideas?
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