As I have said in the past, if the economy craps out, gold and silver WILL be useful currency in the very beginning, and if it looks like there will be a recovery within a year or so will continue to be. If not, eventually barter will kick in driven by shortages. However, at some point we will again start using currency for the same reason that it was invented in the first place. It's way more convenient than carrying around a sack of flour. We will again have centralized markets to sell the stuff too. Traditional metals for currency have always been gold, silver, and copper.
I have plenty of small denomination gold bars, silver rounds, and COPPER pennies. I also have alcohol and tobacco products for barter, among other things. CAVEAT: Do NOT trade out weapons or ammo. You may find that they come back and bite you in the a$$ later.