Robi, I'm way behind in emails here so this has probably already been
answered, but: Try shopping for the fabris online at
outdoorwildernessfabrics.com. They are wonderful to deal with--give
'em a call for recommendations, sale things, etc. Their regular prices
are very good too.
Also, maybe if you contact several hammock manufacturers and tell them
about the project and the kids and the school, some will be able to
help out in some way. Sounds wonderful, let us know how it goes!
Dawn, new hammocker (for now I have the Byer Traveller)