Nearyly everyone sells alternators. I see Chief Aircraft lists yours at about $195. Of course you'd have to pay a core charge until they got your core and confirmed it was reusable....but they're honest about such things. You can call them at 800-447-3408 or go to ChiefAircraft.com
One thing to keep in mind is that the belt tension is critical. A little loose and it slips, a little tight and it will eat the front bearing.
