Free: Contests & Raffles.
As far as I know, the biggest/only benefit of a 20moa rail is for long range shooting. Maybe I'm wrong. For a more budget friendly set of rings, I like the Burris XTR rings.https://www.cabelas.com/shop/en/burris-xtr-scope-ringsI've got several EGW picattiny rails. https://www.egwguns.com/scope-mounts-rings/standard-rifle-scope-mounts/savage/I'd do a 0moa EGW rail and a set of those low Burris rings if it was me.