Purebred dogs from reputable breeders are EXPENSIVE, regardless of whether or not they are "pet quality" but you get what you pay for. SOme breeds are hard to breed, pregnancies are hard, litters small, and deliveries are done by C Section so their costs are much higher. Plus all the genetic testing that is done, that most breeders have 1-2 litters a year, etc add to the cost.
We, being ignorant idiots at the time, bought Harley from a backyard breeder for $300. We should have known. We have paid out many times that just in vet bills to fix the things she neglected to do. I DID know to not buy from a petstore, though (however I've never even seen a petstore that sells pups)
If we get a purebred again, we'll likely rescue. Even the rescues are pricey, but not as much.