Try advertising in REAL S&T magazine , I think , last time I bought a copy (a while ago) , they did classifieds , that would give you access to a couple hundred thousand potential buyers , maybe you could do a deal them by doing a writeup on the performance of the lens with come of your better picture to wet the appetite.
Limiting yourself to the local market with such a special item is not likely to be very successful and advertising in the local mags would be a pointless waste of money advertising wize and way too expensive.
You probably have no option but to go international , BUT , be careful only to ship once you have the money (and it is safely banked !!!) before shipping .... lot of scammers out there.
BTW : I plan on winning the $50million Powerball Jackpot , when I do I'll snap it up .... this is a promise