I myself, don't believe in over vaccinating. I get my cats vaccinated every 3 years with the Distemper and Rabies only. I don't take them to the vet to have it done. Rather, I go to vaccination clinics at Petco or PetSmart. It costs me $30 per cat. I do it when I have the money.

I'm a little too nervous to vaccinate my own cats. But that's me. First thing I would do it check the expiration date on the package. If the package has a company name and location (sometimes they also have a toll-free number on it) I would try calling them and asking them about their product.

As long as the expiration date is current, I wouldn't worry about it. It sounds to me like the vet is trying to make money. As long as you know how to give injections and where, just make sure that you keep an eye on the injection site for any possible reactions.

Vaccinating the cats with stuff from the feed store is a hell of alot better than not vaccinating at all.