A while back Chad Waterbury wrote about rope pulling to develop biceps and talked about using a thick rope. The kind that you used to climb up and down in gym class. Where do you think I could buy one of those types of ropes?
Pretty strange that none of the internet search engines return results for "rope"
Check any boating supply companies in your area. I am near Cincy and they actually have a company named Industrial Rope Supply which carries synthetic rope to 3 inch in diameter. Try the buisness yellow pages for your area. Be warned though the stuff ain't cheap.