I built up a spares kit.
Went to Bass Pro Shop and picked up a case very similar to the one above, but mine had very thick latches. Clear with the compartment walls that can be arranged to your needs. Paid a whopping $1.50.
I then sat down with a list of spares that I got from this site (thanks Gents) and spent some time on Brownell's site ordering parts, using my discount.
After building up a lower and launching those damned detents, I bought a bunch!!
I had a lot of fun on this project and always pick up a part here and there from the local fun show or from the EE.
I would suggest putting a rubber band around the case in the event that you drop it and it pops open and your stuff goes everywhere. Ask me how I know.... ETA: Rabbit9, that is the direction I am heading in now. I also have some loc tite, punches, picks and other little tools in the kit too.