Where to find bellows?

I am looking for a pair of round screw cover bellows:

1.5" to 1.75" ID, 2.325" to 2.5" OD, 30" to 36" long
Liquid tight (for lubricating oil)
Similar to Gortite Gortiflex neoprene coted nylon


I can find these at McMaster Carr for about $93 each, MSC is slightly
less, but only up to 24". Gortite direct only stocks to 24" (6 week
lead time on non-stock legnths)

Two hundred bucks seems a lot to spend on two pieces of glorified
vacuum cleaner hose. Any alternate (cheaper) sources (none on E-Bay)
would be appreciated.

Jeff