I've used foam to organize my tool box for years,, Not only does it keep things organized but it also keeps them from getting damaged by banging into each other. I purchased mine thru Kennedy. It's served me well so far.
Yea, it all depends on the location of the main box , ect, ect ,ect. I had 220v run to my garage along with 3) 220v outlets ans 3) 110v (4 way)outlets and a sub panel. It was around $500. Worth every penny.