True Heart Sound in FL put up a bunch Reverb listings for K120s for $115 (per pair?!?), though in the photos they all appear to be E120s and have black dust caps, so I don't know what the deal is (presumably re-coned).
https://reverb.com/marketplace?query=JBL%20K120
https://reverb.com/marketplace?query=JBL%20K120