In article .com,
"Andy" wrote:

These were undersize (in two different sizes, IIRC) for the *real* amount
that plywood these days is undersize. However, I can't remember what I was
looking at when I saw them. Has anyone else seen this recently?

Yes, I remember reading about the same thing - I think I might have
seen it in a flyer from Infinity tools. After checking their website,
they have slotting cutters in 5.5mm, 5.9mm, 5/32", and 3/16". Amazon
also has a 3/16" slot cutter by Freud, but I think Infinity might have
been advertising theirs to go with a rail & stile set.
Hope this helps,
Andy

These are good people to deal with. Prices are competitive.

http://tinyurl.com/h6cy4

To the countertop professionals, they're Lee Valley...on steroids.