An egg shortage caused by avian flu has led grocery stores like Costco, Trader Joe’s, and Sprouts Farmers Market to limit egg purchases.

Trader Joe’s allows only one dozen eggs per customer daily, while Costco has set a three-package limit in stores and a five-dozen cap for online orders.

Signs warn of continued shortages, with some stores restricting purchases to four dozen eggs per visit.

The USDA reports that over 40 million egg-laying birds died last year, causing prices to spike 14% from November to December, with another 20% increase expected, the International Business Times has reported.

Some shoppers report prices as high as $9 per carton, and Waffle House has added a 50-cent surcharge per egg.

Written by B.C. Begley