For me I have items but my main trade item is knowledge of how to make things we now take for granted, like antibiotic, cleaners, fuels. Our group also has the only one of a kind skill sets for our location .
Skills plus items needed is a strong combo, can you weld using thermite? Make black powder? Make soap?make lye? Make charcoal? Blacksmith? Cooper, wheelwright, tan leather? Have you done it in last year? Can you do it without a book?
Always learning, more no such thing as done learning till you die. They can take your stuff they can’t take your knowledge.
There is also knowledge of local area, do you know where mineral deposits are? Natural salt licks? How to make potters clay?
This winter will attempt to make pottery patts to a mass heater. How much would you trade for heat in winter? Here it is life or death -40c for weeks. Pellet stoves in most new places don’t work once no power. The mass heater is made from clay, fibre and sweat all free except the knowhow? Why would you spend on mass heater? You use 1/4 of the wood of conventional Woodstove.