Ebay and Amazon...
...are probably your best bet. You could also check with Maytag dealers to see if they have any collecting dust on a shelf somewhere. Now that Maytag is part of Whirlpool it seems that most of the owner and service literature for the older units that was available even a couple of years ago is discontinued.
I am in the same boat trying to get manuals for my '61 Maytag A700 washer. I scored a couple of repair manuals off of Ebay and one from Amazon that aren't exactly what I wanted but have a lot of good information in them collectively. I'd like to find an ownwer's manual but that will be very hard for a machine as old as mine.
Good luck!
