Scroll through all the bullets (for reloading) and you sometimes see deep discounts on them.
There will be a slash through the normal price and then another price above that.. really easy to see when scrolling.
Could be discounts on powder and loaded ammo also.
I got 4k primers from them last month, and they gave a discount on those as well. I'm gonna have to stop by again Monday and stock up on a few k more and a few lbs of powder.