Where to find a "Makerbot Replicator 2 Extruder Assembly"?

I’m having a tough time finding anywhere that sells a replacement extruder assembly for the Makerbot Replicator 2. Even on this site it’s discontinued. Any suggestions?

I am having the same issue. I teach middle school and I have three replicator 2 models that are giving me issues. I am also searching for new extruders, without any luck. I am thinking I might just have to order some new printers.