I will see what they have precut. On the one I have now there is a border on three sides and one side does not have a border. Once a week I just use a kids plastic play hoe and scrape all the PDZ and droppings into a litter box sister tray. The PDC falls through and goes back on the board and the Pooh goes into the compost pile. Five minute work once a week.Home Depot usually has some precut lumber/sheets of plywood about that size. If you're planning to use PDZ or sand you will need some kind of border on it to keep the sand from spilling out - should be easy to add trim with hammer and small nails. Home Depot will usually cut them to length if you ask nicely.