This one we got at Ikea and used double sided tape to stick it down.
Just measure height width and depth so you get the right size (measure the depth with the keyboard tray open so it doesn't go back too far to be able to access the back bin)s.
$2.49 later my daughter has better places to store pencils, pens, etc. Even looks good with the drawer closed since it matches the desk. You could easily add a trim piece if yours didn't.
Quick, cheap and easy fix.
Here's the before shot : )
