What’s In Your Local Market?
http://rense.com/general71/100.htm
A good list of stuff, and barter is all about stuff and the arbitrary stuff it’s worth… until the Hardhold gains a reputable barter economy (i.e. a large bustling market) the is little stability to rely on… but without a stabilized and regulated barter economy not even a small market will be very bustling.
Keep in mind that barter economics can be regulated and taxed. They won’t stabilize if they are not regulated, they can’t grow if they don’t stabilize, and they can’t be taxed (benignly) if they don’t grow.
Related: What’s in the Hardhold’s junk stores?
http://buccaneersguild.com/one-hundred-random-post-apocalyptic-junk-items/
Could be in a trash heap, a secure junk pit, or that Hoarder’s spillover… or might be just loose items left lying around the ruins?