Metacam

Anyone know where I can buy Metacam without a rpescription from the vets?

My dog has been on Metacam for over a year and every 3 months the vet insists on a consultation (even though the vet has already said that she will need to take this medication for the rest of her life). Our vets charge £50 a time for this consultation and I'm not prepared to keep paying this, to me it's a way of vets making more money. Any idea where I can buy this without the relevant prescription (no consultation = no prescription from vets)?