As to the cost at Fairchild, the skylight gasket material for out Scencruiser (PD-4501) which they keep in stock was 88 cents a foot purchased in a 100 foot roll. $100.00 is a minimum order, they will do less but the cost was closer to $2 a foot. For the same material at JC Whitney it was going to be over $3 something a foot.
GM4106, if you contact them, please let us know what you find out?
For what it's worth!
Jack