They would be better off stocking up on Tide too.

don't forget alcohol and food

Judging from post-WW2 germany, cigarettes were the most valuable thing on the market.

Probably because Alcohol and Food can be fairly easily self made (germany, tradition of beer brewing, you'll find someone, also lots of farmes, even today)

On the other hand, tabacco is from overseas and requires some difficult manufacturing. Same for bullets, mostly.

I think alcohol and food would stay cheap. The things that would replace money are things you absolutely need but are hard to produce without modern civilation. Ie, cigarettes, bullets, gasoline, rifles and toilet paper.

After two weeks food is not going to be cheap, then after "X" time comes the equilibrium and the situation you describe.

But I expect "X" to be pretty long and pretty bad. Like Mad Max 2 bad i.e. years and maybe half the population dead.