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!