Power Supply Parts

Does anyone have either a power supply (about 60V at 10A), or some
of the required parts to make one, available for sale? The most
difficult part for me to find at a reasonable cost is the
transformer (I think I need 36V-40V at 10A or more). I have read
some posts that suggest a zener diode on the output of the supply is
a good idea to prevent additional stepper generated voltage from
exceeding the G201 specs. What size would the zener have to be? I
can guess the voltage rating, about 75 volts. But, are these
available in high wattages (do I need a high wattage)?

Thanks!