Hi, quiltingrannie! I making a purse right now, so I ordered the Bag-E-Bottom from the same on-line store from whom I purchased the purse pattern. But depending on the size you need, have you ever given thought to using either the sides or bottom of your laundry detergent container, or even an empty, plastic, gallon milk container?
The cut acrylic from one of the lumber supply stores will probably work better, but. . . Good luck with your project!
Patty in Ohio