I checked with two friends of mine that make custom wood furniture, as a hobby and small second income, and both said the pit box prices for all the boxes we were looking at was about what they would expect. Neither of them could build a box any cheaper no matter what the volume. It looks like we either build our own, buy a tackle box, or buy one from the listed suppliers. I would like to say I have the time to build one but I am currently working on this slot car project at a hobby shop. I know, you have heard that one.
Marty