I'm late to this one, but I just had to add my 2 cents of course.
. If they are going to be using pee pads permanently, invest in the kind they use in hospitals. There are a few ladies on here that sell them. It's better for the environment, and cheaper in the long run as the cost of the disposable pee pads adds up quickly. I started out doing disposable pee pads at first and bought two packages at first, and now I have like 30 pee pads.
Which is great because I have stacks of them all over the house and cut them up to make different sizes and such.