I'm throwing this out there w/o following up on a source that I haven't used in a few years but since I have this top of mind right now, I figured I would post and see who would be interested.

There's a flea market a few towns over that sells old big-rig 18 wheeler tie down straps. These suckers are huge and I mean huge. Bigger than any yellow tow strap you could buy. Double looped straps. No hooks. Last I visited, his going rate was around twenty bucks. Of course I wouldn't charge anything for picking them up but after shipping and handling, it shouldn't come out to be too expensive.

Any takers? I'll post a photo of them after this weekend if anybody is interested. Again, I need to check back with this source to see if they're still selling.