Maybe this has been discussed elsewhere, but I found some line that looks similar to that initial link but is pretty stiff and extremely inexpensive.
Wellington Marine Utility Line, 1/8th inch. Diamond Braided Polypropylene (30lb working load). A small 45ft spool is 1.88 at Wal-Mart in the Boating section. I've found it in pink / green / orange (all neon).
There's no stretch, it's light, and does not tangle.