Buy One get One Free Add on question

Hello
I was wondering if the Buy One Get One Free add on works for a category. In other words if you buy 12 in this category you get one free from this same category.

The category has about 60 subcategories and with an average of 10 items each of the subcategories.

So will buy one get one free work for me or is there a better add on.

Still loving the zen cart......

Mona

You might be better off using a Mod from ThatSoftwareGuy Quantity Discounts for 1.3 . though you probably work that out for yourself by now.