What does POS stand for in that context?
Because it looks like the other one.
As others have said, it means Point of Sale, and, most likely, it's stating that if I, as a theater owner, orders this package (or a few of them) I get the little cardboard standees that hang out around the register advertising these (or maybe even posters and other props). Essentially, you're not just getting the merchandise, but the promotional materials useful in getting people to want to buy the merch.
Also, this is a really odd thing to have been posted here (or anywhere for that matter). But, hey, theaters would probably love them, they cost less than $2 a piece, I can ramp up the existing, already inflated price of my drinks by easily double that, and even offer free refills, if I want.