Being an animal rescuer or foster parent means never having enough bedding. EVER! I started out using bath and hand towels, depending on the size of the kennel. Through normal wear-and-tear, towels became very precious in my house! So, I started looking for another source of bedding, and I have found it right in my neighborhood: the local laundromat where I do 'cat laundry' at least weekly. My laundromat has a bin of 'reject' laundry free for the taking, and about half of what is thrown into the basket is t-shirts. I've found t-shirts to be a comfortable, absorbent material for kennel bedding when folded to fit. Older or ill animals appreciate a cushion made of several t-shirts folded together, covered with another (you guessed it!) t-shirt! In a non-frugal moment I usually throw away the shirts used by transport animals or feral cats. I am just too cautious about the germs that might be shared through reusing them. Still, they are at least mostly biodegradeable, I tell myself.