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Carry a small Escher or Thuringer or Coticule. Then you can ask them to watch for one for you. Got a couple that way!
~Richard

Time fo my old tale:
I was in Buda, TX at an old factory made into a Antique Mall. I told the extremely huge Denizen of the dark by the Doorway that "I was looking for..." Didn't get to finish the...

If you are a regular at a few antiQ shops, they will often give you a call when something new comes in. Remember that there are often as many as a hundred vendors in a MAll. so talking to one does...