What will use for trading?

Bic lighters.

Bolts of material, like canvas, nylon, silk, terry, jersey, denim.

Elastic

Nylon thread. Copper wire

What happens to those who need insulin? How does that work i wonder.

You can buy a 50 lb block of plain salt at any feed store for about $5. Salt has been used for trade since ancient times.

There are many scenarios where neither Cash nor Precious Metals would become useable or appropriate in an economic collapse or society destabilization.

You would need to be very discrete so as to not invite attack.
Plus have friends next door where you're in a local militia.
Understood.

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What would you consider stocking for trading?

Alcohol
Medicine
Other drugs
Bullets
Food
Tools
Batteries

But even without power, were not in ancient times anymore... how much salt would you trade me for my coffee? Or tobacco? How much salt for two AA batteries?

That depends on how badly I wanted some coffee and a cigarette. The value of an item will depend on what one is willing to give up to obtain it.

Anyone who knows how to repair generators is gonna be livin in hog heaven too

Im thinking only in terms of their desirability vs scarcity. So you dont smoke. Theyre highly tradeable. Especially beacuse they cannot get wet. Anything that cant get wet, cant get too hot or too cold, that cant be exposed to light like food oils... will prolly trade for more im thinking.

But i could be wrong.