I had no idea this was going on...
I've bought 'old' auto jumper cables for $0.50 to $2.00 each. Some of the heavy-duty cables can be worth $10-20.00 each for the copper content.
Other items I'm collecting for barter, Coleman camper stoves, propane/gas lanterns, chain saws/and parts, 20 pound propane tanks(that I fill), throw away Coleman one pound propane cannisters (I refill those myself), etc.
If the electricity goes out or...people can't afford the bill...these items could be in demand and traded for items that I need.