Don't sweat getting the absolutely lowest cost on a firearm purchase. I have bought some pieces from "premium" dealerships just because I like their business and staff. Also, you can go to a football field and see how many of your paces make 100 yards. Walk it at least three times to get your pace. That way you will be able to confirm distance after a shoot. The math is not that hard.

I first measured my pace in the Marines in 1974. It is the same today.