Fargo 3D Printing sells the exact one for $45 and was shipped insanely fast. I bought one when they were in stock. Website says they have one left.
You may want to contact them to see when they will be available again.
http://www.fargo3dprinting.com/
http://www.fargo3dprinting.com/produ...-thermocouple/

I tried a non OEM one that came with a new extruder and it did not work