Yeah that UPS to USPS deal is TERRIBLE. I've seen packages go all over the metroplex for days before final delivery. Now, first place I check is Amazon. You'd be amazed at the amount of hunting, firearm, and reloading products they have available and alot of it is eligible for prime. I ordered my entire reloading setup, Wiebad bags, Vortex scope, Magpul furniture, and countless other items off Amazon almost all of it free same-day or 2-day shipping.
My next place is Brownells and Midway but I usually wait until I have a few things to order and they have a free shipping or % off. I just ordered 1000 bullets from Brownells the other day on clearance with free Fedex shipping.