If you are looking for rope too dangerously used / abused to actual use I'd suggest ebay. Sadly they usually they include the "used once" or "used just one season" in the description despite being horribly unfit for actual use (core shots, heavy abrasions, chemical exposure).
If you wanted the new stuff I could help you out. Or if 8mm accessory cord will work I've got spools and spools that I could put on sale.
Thankfully they are usually priced appropriately so $15 may find you a 60M rope.