I just received this notification from Midway:

Product Arrival Notification

Great news, this is your requested notification that we just received a shipment of the following product:
Smith & Wesson Magazine S&W...

Smith & Wesson Magazine S&W 39, 439, 539, 639, 909, 952, 3904, 3906, 3944, 3946 9mm Luger 9-Round Stainless Steel

Product#: 162234
$35.99

When I logged onto the website to order one, I saw there is a maximum 3-unit limit for ordering.

Something to think about is that the factory 3913/908 8rd & CS9 7rd magazines have been listed as Discontinued. You can still order some of the parts, but not the complete magazine assembly, itself. Not even from the factory, as I asked about it as an armorer a couple months ago when I was ordering some springs for the M&P series. Who knows how long it may be before these 9rd magazines may also become Discontinued?

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Ret LE Firearms inst & armorer