Plastic Easter eggs - ISO sturdy ones

Lisadi

 Has anyone found some sturdy plastic Easter eggs? DS loves to play with the older ones at grandma's house, so I've been looking for some for our house. The recently purchased ones are now very flimsy, presumably from being made with less plastic. They bend in when pressed, and don't retain their shape. It's very frustrating for him because he can't manipulate those like grandma's.

 I've found p.o.s. at Walgreens and our local grocery store. Where else should I look?

 TIA!