Got mine from these folks:
http://www.atrebuilders.com/rebuilt-01313a-water-pump.html
matched the casting number on my original pump.
How much was the pump? They don't have a price on their site.
Zimmermans sell them for about $85.00. They also sell a rebuild kit that I opted for @ $40.00. You'll need a lathe to install it.
I knew what Zimmerman wanted for them, was just curious if this AT rebuilders price was any better.
Their toll-free number is 1-800-748-9567