Found this website that you can order any type of foam, for any type of case or box.
Case Club also carries all brands of carrying cases, shipping cases and equipment cases.www.caseclub.com
They have a "box size application" where you give them the Length x Width x Depth of the box you need, and it will tell you which brand and which case/box fits your criteria.http://www.foam-inserts.com/foam-layered.htm
The above url allows you to choose the type of foam and get a price quote on the exact size you want.http://www.custom-foam-inserts.com/foam-types.htm
This url explains the different choices in foam besides pick-n-pluck.
Whatever case or box you choose, you can have the foam inserts made by Case Club "Custom Foam".
You get to choose several types of foam from soft > hard, even convoluted foam for the top.http://www.caseclub.com/custom-foam-inserts.htm
I ordered 3 pieces to fill my SKB box: bottom, middle custom-cut, and top made of convoluted foam.
Bottom and middle foam was polyethylene foam which is harder than polyurethane and does not absorb water.
Polyethylene foam is like the long foam noodles you use in the swimming pool.
They even cut the sides for the hinges and radiused the corners for a perfect fit.
Amy Hallenbeck of Custom Foam is helpful and ready to assist. She will even call you to clarify your order !
No, I don't work there and don't have any connection to Case Custom.