Lowe’s here doesn’t stock anything grade 8. And grade 5, only goes up to 1/4 inch.
Home Depot only stocks grade 5 and below. But all the way up to 1 inch.
I go to Tractor supply or rural king if I need it the same day. Cheap and they stock grade 8 up to 1.125 inch diameter and as long as a foot(que Karl).
if you’re not in a rush, McMaster Carr has decent prices on bulk stuff