There has been a 48% increase in eggs being detained at U.S. ports of entry this fiscal year compared with the same time last fiscal year, according to Customs and Border Patrol. The Guardian reports that, in San Diego, these “egg interception” cases have increased by a whopping 158%. People caught trying to smuggle eggs into the U.S. are fined $300.

A surging bird flu outbreak has affected nearly 19 million birds in January alone, sending prices soaring, and eggs scarce. Officials forecast a 41% increase in egg prices this year. Where they are available, consumers are often limited in how many they can buy at a time. Breakfast chains such as Waffle House and Denny’s have added a surcharge of $0.50 per egg on their dishes.

On March 10, the U.S. Department of Justice (DOJ) said it had opened a probe into U.S. egg producers, over claims that companies have colluded to inflate costs to record levels.

Read More: Egg Prices Rising Beyond the Impact of Avian Flu, Report Suggests

As a result, U.S. shoppers near Mexico are seeking to buy eggs there, where a carton of a dozen costs about $2. But importing raw or fresh eggs, raw chicken, unprocessed avian products and live birds into the U.S. is prohibited because of concerns about diseases such as highly pathogenic avian influenza – also known as bird flu – and another highly contagious avian illness called virulent Newcastle disease, according to CBP.