Two areas to look into. 1) As mentioned in the earlier post, check some electrical shops for rebuilt units in stock or the ability to rebuild yours.
2) You have nothing to lose, so open up the motor yourself. Mine completely failed and if I remember correctly, the only problem was was a sticking brush. If yours is only making noise, check for a loose part that's rubbing or bearings that have gone out. While inside, check the winding resistance to make sure it is good.
If the windings are still good, an electrical shop should be able to rebuild for less than $100. My car is a 79 and I'm only assuming we have similar blower motors.
I agree that the only time I can tell a difference with my blower is at idle.
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