These boxes are inexpensive at $8-10 each or about $0.40 per compartment. Plano seems to a major brand but there are plenty of others all within the same price range.

They come in a variety of sizes and, depending on the model, there is some flexibility in changing compartment sizes. Be careful, if you have enough and you stack them up, trying to get the one on the bottom out is a recipe for disaster; boxes and parts everywhere.

They make these nice wire racks to avoid the stacking problem, either in mountable variety (above) or free standing.

Plano seems to have some focus on fishing, so they also sell this water resistant cabinet but expensive at $600.