Updated: Sep 17, 2019
With the recent launch of SNES games for Switch Online we now have release and ordering info for the official controllers to go along with the service.
For $29.99 each you can purchase up to 4 controllers direct from Nintendo to begin shipping on September 18th if you have a paid Switch Online Membership. Each controller includes a USB Type C charging cable. I purchased one and with shipping to California it came out to $37.70.
Will these be use-able on other platforms? I think they mite, but we won't know until they ship. Stay tuned for more information. In the meantime if interested you can purchase the controllers here https://bit.ly/2lX6Nz2
Remember you must have a paid Switch Online Membership to have the privilege of ordering these!