CVS lately is the only place we've recently been able to find the child size ones. Used to be all over, Rite-Aid,
Walmart etc....
I can tell you first hand... THEY REALLY REALLY REALLY WORK !
My oldest son had many ear infections before he turned 5 years old, and his eardrums are quite sensitive. We have gone on a flight without them, and let me tell you.... he was out of his mind in pain.

I never saw such a thing, nothing we said or did consoled him in any way. It was like something you'd see on a movie or something. Next time, we used the earplanes and AHHHHHHHHH what a difference, you didn't even know we were taking off /or landing, which is the time when the pressure hits most.