For sale is a used thermally protected 3 Horsepower single phase Baldor motor. 184T frame. It has a popup breaker that pops up if the motor is overloaded.
Since a lot of people have no idea what 184T means, here's a link for you: http://www.conweb.com/tblefile/frame.shtml. It explains shaft diameter etc.
Besides this motor, I have a really nice pulley that is 9" in diameter that fits it perfectly, it is made for two regular sized V belts. This pulley is not included. I figured that you'd likely need a different pulley, but anyway, if you are interested let me know.