Many thanks to my buddy, David Korchin (K2WNW), who noticed that Anon-Co is selling a new 2014 production run of the Tecsun PL-660, which includes an Auto Sorting Memory feature.
Anon-Co states that Auto Sorting Memory organizes all stored station memories automatically, removes duplicate stations and “sorts the sequence of stored stations.”
The new feature is enabled via the AM BW button.
Click here to view the new 2014 Tecsun PL-660 at Anon-Co.
UPDATE: Tom Stiles noted that his PL-660, purchased in September 2013, has this feature as well. I just confirmed my PL-660 (purchased around the same time and pictured above) has it too.