I had to buy a packet of articles from the bookstore for my OD class. All it is is a bunch of copies of articles... so printed paper.
How much do you think this cost?

And here is a picture with a shot glass to reference (I figured everyone would know the relative size of a shot glass :))

The person who guesses the closest without going over wins free babysitting from me when I return to where you live! Or if you don't have kids I will buy you a candy bar.