There is also a spot on P3 that will show you what your commissionable sales are when you are figuring things about. But remember it's about the host, not you so make sure that you are still getting your host the best deal.
My stepmom once wanted a set of pans and that was it. She earned $90 free towards it but she could get the set for the same price using a half priced item and then get $90 more free. While it would have made me more commission to let her just get the set of pans I made sure to let her know that she would pay the same price for more just buy using her half price item. It is about the host, not us.