I got mine here.... they have a lot of worthwhile stuff, so it's worth the trip.
Surplus Tools Denver, CO - Surplus Tools & Commodities
They also have....
odd little glass vials and droppers, good for my water treatment kit
heavy seat belt strapping. various webbing, mostly military
heavy duty vinyl upholstery, I made semi-dry bags for the kitchen stuff
camp gear, tin plates, utensils
canvas tarps, I use them to wrap my rubber in storage and transit
scrap aluminum plate, I used a piece for my seat platform