You can get some very good deals now, as the economy is bad.
BUT.....you are not going to find a used one with a subframe to fit your
tractor. There are just too many different CUTs which all require
different subframes.
That said, you can buy a used hoe, then buy a new subframe from the
hoe maker. Woods Equipment makes more different subframes than anyone,
but they take a long time to ship and cost over $1000 (4-pt). Your
TC35 takes pt #1020688 or 1025575 if you get their BH80-X hoe. That's
just an example. If you find a Rhino, Bush Hog, Bradco, or other hoe, those
companies likely support the TC35 also.
Most name brand hoes are probably OK. Watch out for the Chinese hoes....
they have a variety of names, like LW-7, LW-8, etc. Expect to pay $2500 to
$4500 for a good used hoe, without subframe.