Woodcraft, AZSil were contacted this year - I didn't contact Augums, as they're a Steebar company, and didn't know if they were trustworthy, and didn't even think of Woodchips!
TSwoods, and Glimmers and More I've never heard of...
Maybe next year, see if Rizheng wants to sponsor a contest? That would go a long way to proving that they're reputable...doubt they'd go for it, though...
Would Dupont be approchable for Corian, I wonder?
I tried a few guitar suppliers for pickguard material, but no luck...would be worth a try again next year...
Also, from looking at my follow-up email contact sheet, I tried to get donations from the following (but was unsuccessful): (I think I'm missing a few, but shows how many rejections there were, for all the successful ones...)
Penn State Industries
Busy Bee tools
Claphams Bees Wax
Highland Hardware
Hut
Klingspor
AZ Silhouette
Bow River Woods
Pipemakers Emporium
Oneway
Teknatool
Hartville Tool
Exotic Burl
Cutting Edge Tools
West Penn Hardwoods
Don Pencil
Gilmer Wood Co.
Berea Hardwoods
Suffolk Machinery (Timberwolf)
Harbor Freight
Viking Bandsaw Blades
Glaser tools
bestwoodtools.com
Stewart Macdonald
Little Machine Shop