I had the same problem. I really wanted to make one last Christmas but waited too long to start looking, and from what I can find now; it appears the original Karen Foster box is discontinued. Her new design includes a "door" of some sort over the drawers.
The only other thing I found that is similar is here:
Kaisercraft Advent Calendar
That seems kind of cool; and if you are extremely creative it gives you all that open space in the middle for LOTS of decoration, not just the drawer fronts.