I've found that the little mom and pop hardware stores have a better selection of grade 8 hardware vs the mainstream stores like home depot and lowes..
Agreed, my local ACE has a much better selection than any of the big stores. The worst selection I've found is at Tractor Supply. Half their stuff is always empty or in the wrong bins.
But if you have the time, I've been getting a lot of my smaller stuff from Amazon. If you look hard enough you can get most things cheaper than most other places.