This article is from the Food Preserving FAQ, by Eric Decker firstname.lastname@example.org with numerous contributions by others.
From Carol Nelson : Here are some sources for Clear Jel in western
Oregon. I have no idea if they will mail order, but it won't hurt to
give them a call. Our local Extension offices sell Clear Jel for
$2.00/pound for an idea on price. Captain Albert's Good Things/ 254
Commercial/ Salem, Or (503) 364-6511 Friedman's Microwave Store/ 1120
Lancaster Dr NE/ Salem, Or 364-0538 or 1-888-380-4372 Burrow's Country
Store/ 635 Wallace Rd NE/ Salem, Or (503) 585-2898