I get lots of stuff delivered from the strangely named https://www.dolphinfitness.co.uk/
They also have a weird multi-buy discount system which makes it cheaper the more you buy. I have not researched who they are, but their prices are cheap.
Otherwise I try to buy from my local organic shop - not the Planet Organic or Wholefoods rip-off merchants though who would suck you into a sort of Sex & the City hallucination to keep your mind off the prices!
