https://www.vox.com/recode/2021/12/21/22848286/omicron-rapid-test-covid-19-antigen

Rapid tests are sold out everywhere, and help might not come until next year.

A surge in cases driven by the highly transmissible omicron variant has stretched America’s Covid-19 testing capabilities to their limit. Rapid antigen tests are out of stock at many drug stores, and lines for PCR tests stretch around the block in cities across the United States. The problem will likely get worse as more people travel for the holidays and fuel new outbreaks, long before new supplies from the federal government are scheduled to arrive.