I use to buy all my grade 8 hardware from them when I was fabricating offroad bumpers. They sold them by the pound and it was reasonably priced. Now they sell it by the bolt like all the other stores so I just buy them from Ace when I need them now. I don't find myself going in there as much as I once did for other stuff. Stillwater milling gets more of my business now.
Not sure that they have grade 8 hardware, but you can still buy hardware by the pound at Tractor Supply. It is significantly cheaper than Ace.