You could use a computer AT power supply and flip the voltage switch on the back to 220v from 115v.

I run a computer power supply in my MVS 4 Slot machine.
What I did was took all the reds and wired them together and made one connection point. Took all the Yellows and did the same, and again with the blacks.
Yellow is 12volt
Red is 5volt
Black is ground
This was suggested by Ben at
www.benheck.com as he did the same thing with his neo geo 4 slot. Mine works great, no problems at all..