Your number are not the same as I was using:
Wall Connector: $495
GFCI circuit breaker: $100 (the cost difference could be a little less than $100, might be a little more than $100 over the cost of a standard standard double pole circuit breaker)
Receptacle box, Hubbell 14-50 receptacle and cover plate: $100
Tesla NEMA 14-50 power plug adapter: $45
Cable Organizer (optional but you would need a way to hang up the charging cord.) $35 (the cost of a cable organizer could be a bit less than what Tesla charges for their cable organizer or you could make your own.)
$495 - $275 (old price) = $225. Factor in $245 for the additional Mobile Connector items and the Mobile Connector with NEMA 14-50 ends up costing $20 more than the Wall Connector (Note: these costs do not include the cost of the wire or installation.)
$495 - $200 (new assumed price for the Mobile Connector) = $295. Factor in $245 for the Mobile Connector and the Wall Connect costs $50 more than the Mobile Connector (at the new price) with NEMA 14-50 receptacle.
For $50 more you get the longer charging cord, the ability to do load balancing with a second Wall Connector, a fully weather rated housing and the ability to only charge specific Tesla vehicles based on the VIN.