Bad form to respond to myself, I'm sure, but here's a link to some Spectra that's $.24 per foot, which works out to about $6.5 for the same length cable. This one doesn't have a braided sheath on it though, which may be better for smooth motion but less rugged.

This came up from a quick google search of "spectra cord".

http://www.spearitco.com/index.php?main_page=product_info&products_id=199&zenid=1d10b9e8aecc6901b0110fe043f40eb5

FrankP