I ended up not going to Fastenal, because of the time and commute it would require, but I’ve found that for SAE stuff HD and Lowe’s were on par, but Metric was significantly cheaper at Lowe’s to my surprise. I was able to buy bolts, nuts, washers and locking washers roughly for the price of bolts alone at HD. I remember when Lowe’s was more expensive than HD not too long ago.