I had searched all over for these after a friend ordered some Georgetown cupcakes and I got a peek at the packaging.
I wouldn't be surprised if these are made special for them.
I also think you could get away with just a regular deep dome clamshell plastic cupcake container .
They ship frozen , VERY frozen, the lollipop sticks hold them in place very well, and even if they did slide, they are so frozen I don't think it would have too much of an effect.
As long as your sticks were long enough that they press on the lid, I'd take my chances and ship.
To a friend or family member first of course