Possibly you can still get a waterloo one. Waterloo is the oem and sells the same box under their name, use to be the magnum line. Thing is with these boxes is seems like they were discontinued five or so years ago, then they reappear, disappear, repeat.
Have you tried "Sears Outlet" online? I found my Craftsman Pro box there even tho they had been discontinued for years. All of the boxes were out of state, but they do ship. Luckily I was traveling and was able to pick mine up in PDX.
Try doing a Google search? First by item number, then model number. An individual may have one?
