It's great to see these posted. When I had my Garmin that used these, I looked high and low to scrounge them up (not sold new anymore); yet I just *knew* there were probably some in someone's boating stash, but maybe they just hadn't thought about selling them.
I didn't know about TF then, unfortunately.
Hopefully this isn't an intrusion into your ad --- I don't even have this particular card so I'm not trying to compete. But if there is still interest, maybe I should pull mine out and dust them off (I no longer am using that plotter).
In case anyone isn't familiar, these work in many still-useful Garmin plotters and aren't obtainable new anymore. Examples are Garmin GPSMAP 172, 172C, 178, 178C, 182, 182C, 188, 188C, 2006, 2006C, 2010, and 2010C.