Foam for Fly Box

[bowfin47]

Joann's has 6mm in limited colors, black, white, and maybe red. Here's a source for additional colors although looks like only four packs.
http://www.craftsuppliesforless.com/...amsheets2.html

Micheal's Craft Stores also carry 6mm foam that can easily be slit to work like the foam in Cliff's boxes...