Rosa, this place has good prices on puppy pads. I don't think you would need the premium ones - you just need a pad so it doesn't get on anything, right? With urine, the heavier pads are better, but since it's for poo, you could get away with the cheaper ones. https://best.valuepetsupplies.com/products/valuepad-puppy-pads
If you have Costco or Sam's Club, they have really good prices on pads too.
Samson, GSD, 10/13/07
Annabel, Keeshond, 4/21/11
Petie, Toy Poodle, 5/5/07
Kitties: Meezer, Bob, Mia and Dewey