Where can I find a replacement battery cover?

I have scoured for a good ten minutes, this internet of ours, and I cannot find any place to buy a battery cover for this keyboard. Normally, most keyboard would get the glorious scotch tape fix, but this keyboard’s battery cover also contains a missing rubber foot which stabilizes the thing as I type. So it is much more than a mere ‘battery cover’ and yet, I cannot find it anywhere.