There is more to picking the motor up somewhere else.....shaft diameter, shaft length, flat spot on shaft, rpm from the gear reduction....probably 2 rpm. Grainger Supply has them also, just make damned sure you have the same creature.
Do a search on Grainger.com for your intended replacement. ALSO, check the frame mounting holes, some are not compatible. If you cannot get satisfaction, please call the fine folks at Keystoker and it will be shipped same day.....

I have not seen them at Tractor Supply, however many pellet stoves use the same motors....just remember to check the shaft size and diameter,