I believe you have another thread with the same title.. I answered there.
The OEM motor can be purchased for about five hundred as I recall
Some folks and I can point you to one can get you a 3rd party, takes a bit of adapting (not very much, you change the cradle a bit is all, same screw holes in the frame) for about half that.
I happen to have a spare I'm still deciding on.
IF you need to replace the entire unit.. I just replaced one of mine, ADVENT AIR makes a upper unit that with their adapter cable will fit on the carrier and almost work just like the carrier.. (By almost I mean the 15,000 btu draws the same power as the 13.5 BTU carrier. in short it works better) Operationally.. IDENTICAL.
You should be able to figure out how I know.. Installed it.. YESTERDAY, a scant 25 hours ago.
Home is where I park it!