I checked with Chaney Instruments (Lake Geneva, WI), who owns/distributes Accu-Rite. This unit is exclusive to Home Depot (HD) and doesn't appear on-line with HD, so you have to go to a brick-and-mortar HD store. In Cedar Rapids, IA I discovered that they don't carry it, have no plans to order it, and the same is true for all their stores in the midwest (e.g., Des Moines, Chicago, etc, etc). The HD person helping speculated that it is particular to their 'warm weather markets.' So, they found that store #0485 in Phoenix has 4 (3 now

). The HD item number is 484367. They agreed to ship one to my home address for a grand total out-the-door of $32 and change. That store's phone number is 623-849-0125 (try extension 383, Eliza was most helpful and gracious) in case anyone else here in the midwest would like one.
My wife is excited to know the pool temp from inside the house. I'm excited to use the charting function to learn more about the effectiveness of my solar panel system, effects of night-time cooling, the effect of the solar cover, etc (I am a scientist by profession, after all).
kelly