This is what I recently found on ebay. Hopefully this link will take you right to them, if not, my search parameters are: 60 KHz receiver And, I set the search area to North America $10 and change, cheaper in quantity. Link: https://www.ebay.com/sch/i.html?_from=R40&_nkw=60+khz+receiver&_sacat=0&_sop=15&rt=nc&LH_PrefLoc=3 Kurt