Hi, apart from the first tub I got from the vet, I always got them from ebay, and have used various sellers. ebay.com has always been the cheapest, but you have to find a seller who will ship to the UK. Have never had any problems using this method - The last time I got them I bought a tub with 650 in, and shared them with a few friends, it then worked out to be �14 per 100 tablets which was very cheap. Just make sure you get the Cosequin DS, which stands for double strength, and you will have to give double the maintenance dose for around two weeks, all instructions are on the tub. There are two different sorts, chewable and capsules, doesnt matter which one, I have used both.
http://cgi.ebay.co.uk/Cosequin-ds-for-dogs-che wable-tablets-pk-of-120_W0QQitemZ270179401814Q QihZ017QQcategoryZ20751QQssPageNameZWDVWQQrdZ1 QQcmdZViewItem
or
US Seller selling double the amount, and only slightly more expensive if you add the postage, so works out cheaper
http://cgi.ebay.co.uk/Cosequin-DS-CHEWABLE-TAB LETS-250-Count_W0QQitemZ130167161877QQihZ003QQ categoryZ134754QQrdZ1QQssPageNameZWD2VQQcmdZVi ewItem
or if you would rather use an online veterinary company, i have used vet uk and have found them very reliable with next day delivery
http://www.vetuk.co.uk/index.php?main_page=adv anced_search_result&search_in_description=1&ze nid=4902b03a656755bcc000f9c2092655d7&keywor