Hammers, nails, tarps, handsaws for structure fixing; hygiene items (esp TP), blankets, flashlights, batteries, rope/cordage, hand-crank radios.

Plenty of these things can be had inexpensive, especially if you are getting them for the sole purpose of barter.

My $.02
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor