Deane, there are only three places in the US that I am aware of where you can do this. Washington Music in Rockville, Maryland, and our Synthzone members stores in New England and California. Beyond that, most music stores in the US cater to guitar players because that's where they enjoy the highest sales volume and greatest turnover. The local store where I live only carries a few keyboards now, almost exclusively Yamaha and a couple Roland models - that's it! At one time, he had three dozen keyboards in the store, but they just sat there, waiting for a buyer.
I believe that much of this is because online sales are killing the mom and pop stores that we all relied on for our musical instruments in the past. Other than GC, there are very few music stores around anymore. So sad.
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)