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I'm not at all surprised that Amazon sellers of high-end consumer HF receivers are nowhere to be found. The marketplace has shrunk. Profit margins are minimal.
The consumer marketplace for self-contained high-end HF table top receivers has been declining for at least two decades. Just look at the shift in WRTH receiver reviews in the annuals going back to the 1980s and 1990s.
JRC ended production of the great NRD-5x5, as did Kenwood with the R-5000. ICOM hangs on with its IC-R75, but it is long in the tooth. Yaesu had the FRG series, but those were also-rans. Drake went out of business. And the beat goes on.
The consumer-level computer-control black box receivers were rough at the beginning, exemplified by WinRadio. Their high-end versions are better now, but for exceptional HF reception there isn't much to chose from.
There are numerous RR threads about aspects of the consumer HF receiver choices that further illustrate the decline of the tabletop. The profit margins are squeezed, badly.
And, frankly, it's very easy for a listener to grab an app or three and load them onto a smartphone. Tunein, radio.com and iHeartRadio cover the world so long as you want broadcaster coverage, not specialties like air, marine or numbers stations.
Just some thoughts, barely scratching the changes...