You might look online for some BB-5's or BB-7's. Extremely cheap yet pretty decent mechanical disc brakes that should work with your existing cable levers. Good Luck!
Believe in yourself? Well sure, of course. But be aware that "believing in myself" has been the root cause of most of my injuries.
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"I feel sorry for people who don't do this." -Badfish41- after bombing the Hermosa's at Levis Trow.