Bolts in bulk? Anyone done this? What sizes?

After spending the morning with a parts manual and then an hour at the store counting bolts into a bag and then paying a premium price by the each, I begin to wish I just had a big stash of bolts on hand, since I've got several cars I'm going to be assembling from basket cases.

Back when I worked as a gas pump jockey (in the days of 'check your oil too ma'am?') the station had rows of bolt boxes at the back workbench and if you needed something it was always there. I'm about ready to order up a bunch of these myself. figuring a lot of 3/8" and 7/16", and 5/16" for body panels, in assorted lengths 1" - 2"

Has anyone done this? What sizes did you find most useful for mopars?