California, Feb. 13 -- More US grocery chains are implementing egg purchase limits as bird flu outbreaks continue to disrupt supplies, with California shoppers particularly feeling the squeeze through restricted purchases and early morning queues.

At a Costco store in San Jose, California, the warehouse has been limiting purchases to three cartons per customer since Saturday, according to a store employee named Pauline. By late morning on Tuesday, only 15 cartons remained -- all higher-priced organic brown and green eggs, with no white eggs available. The store has posted the sales limit sign at the entrance, effective Tuesday. "You need to come early to make sure you can buy eggs," Marcie Lopez, a customer at the store, told Xinhua news...