Maybe create a thread asking who else would be interested in that size and color and do a group purchase of 100 bucks worth, that is assuming that you don't have to buy all 200 feet of it. From memory 50 feet is more than 100 dollars, but less than 150 dollars.
Found this in an old post from 2013
http://forum.spearfishing.com.au/thr...yths-and-Facts
Some companies buy in such large quantities they get a seriously low price on the rubber (5000 ft. at a time). and can sell it to you almost or even cheaper than if you purchased directly from Primeline. Primeline will sell directly to you but you need a minimum order of 100 feet and the price at that level of bulk order would be $2.54 cents a foot for 5/8” x 1/8” ID (Amber, Black/Amber, and pure black) same price. If you wanted to try the new 1/16” ID hold that is 5/8” x 1/16 you would need to order a minimum of 100 feet at a cost of 2.97 per foot.
Neptonics have a 50 foot roll of black:
https://neptonics.com/product/50-foot-box-of-rubber/ for USD109.99 (14 mm)