[OldSchool]

To me, it looks like they still take orders:  https://www.motionwindows.com/products/series-1800/
By-the-way, if I had just one very minor disappointment, it was that the new windows were tinted "lighter" than I anticipated.  Therefore, if you like dark tint (like me), I'd advise that you round-up your tint selection.  I've included an image of a single pane taken out of the original salon slider window with the solid window I put in the kitchen.  You can see the new glass is more see-thru.  I've also added an image of me cutting the inside.  Note, although it took more time and layout, I very purposely cut one side at a time.  It is nearly impossible to cut perfectly square thru that thickness of interior skin, plywood, insulation and outer skin.  Lastly, I've added a side profile view on an installed window, for those curious of slipstream noises and protrusions.