I searched everywhere recently for some after my vet gave me it for my mares MF. The cheapest i found for a big 500g tub was chemistdirect, online ordering. A tub this size with my vet was £50 on here it is under £35 reduced at the moment. However, you do have to have a vet prescription (couldn't find any without) but i took a print out of the page to my vet and they matched the price. Brilliant stuff though, well worth the the money.