Hmmm, I suspect Mike mixed up his windows here, but what the heck. Mike, I am surprised that you are doing any wakeboarding at all three months after back surgery!
A few years ago my son dislocated his shoulder while wakeboarding. It was in June, and we had just bought a new SAN in March so he was determined to keep riding. For the next couple of months he strapped his bad arm down and rode one handed!
Now, back to the program:
Isaac: I haven't paid close attention because I don't own an I/O but I know that Boat Masters II in Pleasanton and Larsons in Stockton have demo props for I/O. Boat Masters is a Mercury dealer so I would assume their props are for Mercruisers. I don't recall what I/O brand Larsons would be.
I would recommend doing a repair/dealer search for your outdrive and calling all the shops around.