unless your going to do thousands of units getting plastic molds tooling is retarded in cost
I found some bins down at "family dollar" (staples has them too for about 8x the cost made by rubbermaid)
http://www.sterilite.com/3_Drawer_Desktop_Unit.html
Along with holding glue and heatshrink I also tend to pile parts up for whatever project I am working on at the time
the top fold down section is more than large enough for an arduino and the back of the top can hold a few rolls of wire, solder etc