Well, if the set in Chicago is gone, and you can work that location, the other matching set was in Rockford, which is only an hour West.
I'd guess waiting and patience will eventually pay off where you're at. I wonder though if there is more competition. The other option is to consider having the units (where ever you purchase them from) shipped to you. It will cost some, but....
I've had a few things shipped, years ago, with craters and freighter, and they did a real good job.
Best of luck in your hunt.