The used

I just bought a 82 720 with a z22 engine. Shortly after I bought it the harmonic balancer came off while driving. I wasn't able to recover the balancer. I would like to find a new or re-manufactured one, but I can't find anyone that has one. I have only been able to find a few used ones on eBay, and I am not to comfortable with buying used parts on eBay. Does anyone know were I can locate one? Thanks