3B2 power supply needed

[David J. Carpenter]

We have a 3B2/300 which could use a new power supply.  The 12V output
connected to the internal hard drive (and floppy drive?) occasionally
decides to drop to about 9 volts, disabling the hard drive.  Since the
machine was in demand, I rigged in an outside supply just for the drive.
This is a very cumbersome arrangement.  

Does anyone have an extra supply for sale, or know how much AT&T wants
for one?		Thanks!!