Update: This item is no longer on sale!Drs. Foster and Smith takes 20% off these ingenious PetSafe Deluxe Patio Panels as part of their sizzling summer sale. Better yet, get $10 off via code 3658576 to drop the price of a small panel down from $159.99 to $129.99 and now $119. These easy to install panels make it possible to create a dog door in a sliding glass door, without having to cut through doors or walls. They are available in three colors and three adjustable sizes. Shipping is from $9.99.