Thank you all for the leads. I called around as suggested without much success. I think one store reported having the Casio's little brother the MZ-X300. And one store didn't even answer the phone (I called several times!)

I've bought boards before without trying them; both times it was a bad experience. It's obvious that Yamaha knows how to get market penetration. I've also seen a few Korgs here in TX, but if Roland and Casio are serious about their arranger business, they need to work harder to get their product into stores. These boards are so rare, maybe their websites should have an inventory locator to help consumers find the nearest store stocking a specific model. It's been done before. I collect high-end model trains (another dying hobby!) and at least one manufacturer has a "product locator" like this.

Or better still, offer a factory-direct demo program. These boards have an enormous feature set, maybe more than you can get into by just noodling around in a store for a couple hours. Store stock rarely have the latest OS. Instead let a prospective buyer try it for 2 weeks with the option to purchase as B-stock, or return it for the cost of shipping. That's a better deal than the restocking fee charged by some online retailers. My $.02, Grrr!