I would think that you could just buy it from the store. Especially if your vet has already been over it with you. You can also purchase it from kingwholesale.com, it comes in a 3 pack for $37.49. They also have free shipping, but they charge you a fee of $5.00 if your order is less than $100. I have ordered other stuff from them before and their shipping is really fast.
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