A long time ago I bought the oversized head style from bolt depot. As mentioned these don't have the dog point as with the Dorman but I recall when pricing them back then that these were much less expensive too.
https://www.boltdepot.com/Flange_bol...e_5_steel.aspx
Recently found a guy who sells bolts at all the local swap meets (Pomona, Long Beach) that had the original style black oxide type but I don't think he's online.