Feed supplements

[soloequestrian]

Does anyone know of any fantastically cheap mail-order sources for magnesium oxide, Yea Sacc, seaweed, linseed and biotin? I've found a couple of good ones on eBay and will compare with the local feed merchant at the end of the week, but very happy to have others suggested!
Thanks!
(Also in NL)

 

[cellie]

I use ebay natural horse cheapest I have found