How about cutting up plastic table mats? That is if you have any of those lying around.

I have always made a sleeve for the cardboard or plastic sheeting to fit in so it can be removed before washing.

I use core board from JoAnns. They sell it in the craft isle. I also make a slip cover (kind of like a pillow case) that can be removed to be able to wash the purses.

Great ideas everyone. I'll start making sleeves for the rest of my purses. So I can go ahead and close up all the bottoms on my purses and put the bows on. I have quite a few I want to make. I can't wait to get the Christmas kitty and Christmas mouse ones done.

I had some leftover "peel and stick" vinyl tile or regular vinyl tile cut to fit.

I use foam core board and cover it with the matching or coordinating fabric.

I use a removable sleeve with matboard also. I put two strips of velcro, one at each end to hold it in place.

I buy a self adhesive floor tile for $0.28 at Lowes. I cut to size with my rotary cutter. I pull off the adhesive strip and stick a pieces of fleece to the sticky side. I have already made a sleeve, slide the tile/fleece in and sew it up. Cheap and sturdy.

We had extra slats from our faux wood blinds and I saved them for the purse bottoms. My husband cuts them to size and rounds off the edges.

I go to my local lumberyard. They have a bin of scraps of plexiglass. They like to get rid of it so they will cut whichever size I want for $.50 each. It is worth asking in your area.