Allied Signal, http://www.alliedsignal.com, has had
amorphous metals used in obscure high power transformers for
years, under the trade name 'MetGlas'.
You can get it in sheets or "C"-cores. At one time they
made torides but I'm not sure if they still do. The stuff
is expensive. A dime sized torid core was $18 in 1988, a
fist size one was $170. The people at that time didn't
seem to have their act together, I had cash in hand and
could not get them to deliver the small quantity (~20) parts
that I wanted.
The sheet division seemed a bit more friendly. I was
looking at using it to make one of John Eklin's devices at
the time.
http://www.namcores.com also as some info on Amorphous
cores.
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