How many cookies are in a box?

Long story short, I'm a Guider from Canada coming in May and I want to get some cookies to bring back to my unit so we can do a taste test!

In Canada we have two flavors, one with 24 cookies and one with 18 per box. I am overwhelmed with the choice the US has! But I'm also curious how many are in each box per variety, because I need to order now and want to make sure I have enough to bring back to my unit and also have for myself.

I've looked everywhere online and I can't find much info. I see that it depends on which manufacturer makes them. I'll be in Massachusetts if that makes a difference.