Brewers yeast..where do you buy yours?

I get mine from Feedmark, they usually have offers on and I buy Rosehips and supplements for the dogs from them so it works out reasonable price for me, also free delivery and it's on your doorstep the next day which living in the middle of nowhere is a godsend for me.
 
I get mine from here http://www.naturalhorsesupplies.co.uk/p/product/1007106235-Brewers+Yeast+900g++%A3399/
Cheapest I can find, although I think charnwood might be cheaper, but with only 2 horses it would take me about a million years to get though a sack of it!

I have 2 x 12hh ponies and have bought a sack from CM. Just running out, now. I did give away about 4Kg due to concerns of it going off, but it still seems to be active. Even given loads away it works out a lot cheaper!

ETA: I bought it in Dec 2009.
 
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