You are not going to like my answer. For a VIA tablet, it is cheaper to buy a replacement tablet than a replacement screen. The majority of low power/inexpensive tablets have a very low profit margin. The screen is the most expensive part. A replacement screen would be easier to find a broken tablet with a good screen than sourcing just the screen.
I can only wish you best of luck. The source otherwise would be China and a location like AliBaba.