You can get poop bags at the store...Target, Petsmart, even grocery stores...look in the pet aisle. I like the Arm & Hammer ones, as they are scented. You can also get a handy little dispenser that clips on to the leash or a belt loop. I use them on walks and throw them in my purse when I take the dogs anywhere...you never know. At home, I use plastic grocery bags (I also use them when I scoop the litterbox)...but yeah, there never seems to be enough, especially with 2 poop machines 
