I just realized i have enough coroplast and room to add a 2x2 upper level to my gp's cage. 1x1 of it would not be over the 2x3 bottom cage. I woudl make a 2x4 but i don't have enough coroplast to make the 6" walls. Anyway.....I have the coroplast but i don't have enought fleece or puppy pads. I just bought the washable puppy pads. So i was wondering if there was something else i could use besides fleece (and loose bedding) that is not too expensive?