1.
Performance Center(R) Pro Series(R) Model 640 | Smith & Wesson
The subject model is still being produced. S&W seems to manufacture various SKUs/models in batches, but may only do so once or twice per year.
2. You might end up waiting only a week or it could be several months.
3. Advice is to order online/Gunbroker. You could then still use your rebate if ordering a brand new 178044. Also, you might as well list yourself on galleryofguns.com for its "stockwatch" system to alert you when this model becomes available. Note, GalleryofGuns may only get a few in and that number could sell out in a couple of days or hours, if not minutes.
https://galleryofguns.com/genie/defa...px?item=178044
This model is my recommendation over the newer Kimber K6S or Colt Cobra models as it's more of a proven gun right now. The K6S and Cobra may be fine firearms, but haven't yet had as much time or rounds to report so far.