With this instructable you can make your own, out of some cardboard and any (non-stretch) fabric you like. The following steps take you through the process. The basic idea is to make a 'box' out of fabric, with sides twice the desired height. Then place cardboard pieces inside this box, and fold the leftover fabric in over the cardboard. A piece of cardboard at the bottom wrapped in fabric holds everything in place. No glue is needed since the stuff you keep in the box will press down the bottom.
Additional note: instead of cutting cardboard bottom and sides, you could also use an existing cardboard box. All you need then is an additional bottom piece to cover up the inside.