I remember reading somewhere on my friends list about a good alternative to the expensive bondage rope found in sex stores, though I can't remember who it was who said it, and the actual details. I think it was a certain type of mountain-climbing rope, but can't guarantee it or what type.
I vaguely remember it either being elfs or fred_bear (hmm, fine company, that's for sure!) but again, can't guarantee it.
As for why I'm asking, I'll leave that up to your imagination.