Supplies by mail order

Hi,
I live in South East London where the most exotic pets most people keep are hamsters (or Pitt Bulls that they don't control!)

I can buy Layers Pellets from my local 'Pets at Home' store but am not within driving distance of other supplies.   I'm looking for a good mail order service for oyster shell etc.  Please can someone advise?

Thanks
Claire x

Thanks for the link, I appreciate your help.  I think I can get it cheaper on ebay! 

Have you asked your local place what they can order in for you? My village shop keeps big bags of dog food, but when I asked they said they could order big bags of cat food for me on request - so then I requested poultry feed and they get that for me too! They have said that if their supplier has it they'll order in for me - I haven't asked for oyster grit yet I have to admit  As an ignorant newbie I got my original bucket from FsoFancy last year, 5kg for £4.99 plus delivery, my local farmers' store sells 25kg for £7 ! it's a 50 mile round trip though so I have to be down there anyway to make it worthwhile - so hurrah for my fab village whop.