I have some junk silver coins and also have some gold coins from before the price shot out of sight. Alcohol and furs have historically been high-valued barter items, though I don't stock excesses of the former and have none of the latter at present. Excess vegetables from the garden and eggs from chickens, if it gets to that.

I supposed I could dust-off my old electrical/electronics skills, but I doubt that my current IT skills would be worth much if we are down to trading fish hooks and corn.