Experiance selling tot bags?

[bubblefine]

I have been going to Anime Boston since the con started, and have always had an artist ally table. But this year will be my first time selling tot bags.
So my question to experienced tot bag sellers is; how many bags would you usually stock for the con? I am doing two different models of tot bags, and having three different images available.

I was thinking along the lines of 10 bags each, but to the experienced what do you think?