Today is the actual retail launch date for both of those models. At the time of this writing, there are exactly two variants in stock on Newegg. Those would be EVGA's GeForce RTX 2060 Super XC Gaming (rolls right off the tongue!), priced at $449.99, and the GeForce RTX 2060 Super XC Ultra Gaming, priced at $459.99.
Both cards come with redeemable codes for Control and Wolfenstein: Youngblood, which add to a growing list of games with ray tracing support (go here to check out an RTX gameplay trailer for Control).
I count another 10 Super cards on Newegg that are backordered, and 15 more with the blue 'auto-notify' button gracing their product pages. It's not that they are actually selling out at a frenetic rate reminiscent of the wild cryptocurrency heyday, it will just take some time for Newegg and others to grab hold of stock and update the listings.
You can also head over to Nvidia and purchase its own RTX 2060 Super for $399. The landing page for the RTX 2070 Super just directs visitors to its retail partners, while the RTX 2080 Super will be available starting July 23.
Pay attention to pricing when shopping for any of these cards. While prices will vary for custom models with factory overclocks and other bells and whistles, the baseline to compare with is $399 for the RTX 2060 Super, $499 for the RTX 2070 Super, and $699 for the RTX 2080 Super. Note that unlike the previous non-Super RTX model, the reference model 2070/2080 Super cards will not come with a factory overclock.