First, it was toilet paper. Then cleaning supplies were impossible to find. Now? It's ketchup.

Before you dump a dozen bottles in your grocery cart, however, know that it's the individual packets that are hard to find, the Wall Street Journal reported.

"The pandemic turned many sit-down restaurants into takeout specialists, making individual ketchup packets the primary condiment currency for both national chains and mom-and-pop restaurants," WSJ wrote. "Packet prices are up 13% since January 2020, and their market share has exploded at the expense of tabletop bottles, according to restaurant-business platform Plate IQ."