I have just used the internet for things like that.
I know a lot of pet stores are not too fond of hunting, even with a lot of owning dogs/buying food and toys. They may have stuff, but I do not know for sure. My only guess may be Dicks?
Just did a quick look at the website and they do have dog training supplies and at least two kinds of bumpers (duck and an orange one). Not a ton of stuff, but they did have it.
KTP is a little farther than the 30 min, but would be a little more fun.
Also noticed they sell the pet doorbell thing. Looks like a paw and when they hit it it makes a doorbell sound. You can train them to do that when they have to 'go potty'. Besides bringing me a duck, it is the absolute best thing and will impress guests as well
BUT I am curious if anyone know of other spots. Good Question.