We use the out! brand from walmart as well. Locally, I haven't found a better deal for disposable pads anywhere yet, without ordering online. We bought a tray from walmart as well, one that has "walls" around it, and Odie hated it. However, we found one that is just basically a square of metal, with four "claws" at the corners that you shove the corner of the pee pad in, and it works well.