Trader Joe’s sells fertilized eggs—but why? And even more puzzlingly, why would people even want to buy them in the first place? We decided to investigate.

Egg prices are soaring across the country, with some stores charging over $10 for a dozen — but shoppers have found one grocery store where the prices have stayed relatively affordable: Trader Joe’s.

To hatch eggs, you need to incubate them around 100 degrees Fahrenheit, assuring the temperature doesn’t drop below 99 degrees. Prior to their incubation, the egg can be stored for a maximum of seven days in a cooler area, this explains their ability to potentially survive the shelves of Trader Joe’s.