And they aren't cheap.
So a free one sure could come in handy.
Go here to print out a coupon for a free new pet exam with a vet at Banfield (regular price, about $45). The coupon covers a regular exam, any tests would be extra.
Banfield is the vet hospital associated with and located in PetSmart stores all over the country. So there's a good chance there is one near you. To find one, check out the PetSmart store locator here.