ILCO has a pretty good selection of Schlage's restricted numbered series, that's more or less disused.
Schlage also has restricted, non-patented system called the Quad, which has designation such as WUTR. I can't find any of these on ILCO or JET catalog.
Same deal with BEST Premium blanks, WA to WH.
Why wouldn't they offer them? Are they really that low in volume to not be profitable to make?