Under Commerce > Promotions there are the two options: Sales & Discounts. Sales is a flat rate with little conditions, so that leaves Discounts.
Discounts have a bit more flexibility, but only seem to have a minimum quantity option. So, if I want to make a buy one get one free deal, I can't limit it to the quantity to a maximum of 2, therefore the discount gets applied to the total amount regardless of how many are added.
Has anyone else had any success setting up a BOGOF deal or anything similar?