I buy washable pee pads from T.Bumpkins:
Washable and reusable dog and puppy pee pads, belly bands, and diapers by T. Bumpkins & Co.
She is also a member on this forum, and you get a discount. I think that washable pee pads are so much cheaper in the long run and look much nicer in my apartment especially with all the different designs that T. Bumpkins offers.