Don't know why, but it is out of production.
Maybe because Walther doesn't have any import problems now or maybe because S&W feels like it might compete with their M&P line.
Oddly enough, Magnum Research was also producing a P99 clone but I haven't seen any this year. Looks even more like the P99 than the S&W version.
"For every problem there is always a solution that is simple, obvious, and wrong." - Mark Twain