- Walmart Collector Con (not sure if it is linked to SDCC, as it would be a coincidence to do the big launch on the same day if it wasn't being promoted at SDCC as well - The Hasbro Pulse site certainly thinks so, as they included them with their new SDCC pre-orders.)

From the Walmart product page...

Velocitron wave 1 - release date August 8th (Walmart) & August 1st (Hasbro Pulse)
Deluxe - us$25 (Cosmos page has been removed from Walmart site - unknown reason as other items remain listed that are sold out) (Clampdown sold out on both sites)
Voyager - us$34
Leader - us$56 (Scourge sold out on both sites)

Vintage Beast Wars - Retrax & Terrosaur - us$25 (each) - release date August 12-16 (Walmart), August 1st (Hasbro Pulse - Retrax listed as November, likely in error)
(Retrax already sold out on Walmart site... yes, it's true... it has to be an error, or else it was produced in much smaller numbers based on it's feedback)

Top Gun Maverick - us$45 - release date December 20th (Walmart), November 1st (Hasbro Pulse - could be wrong)