Where to find a transformer?

I am doing a cnc conversion of a rf-30 benchtop mill. I am looking for
a power transformer to use 110 vac input and output of 35-50 vac at
about 20 amps. I can get it from Plitron but the wait is over 4 weeks
as it must be custom wound, it isn't something they stock. Any
suggestions as to a good transformer supplier. Yes, I am looking at
ebay but couldn't find anything at this time

Bill H