Sony A7III release: April 2018
Date of first A7III sale price in the USA: TBD
Total time between release and sale price: TBD (over 1 year at this point)
Not totally correct. Sony just does this stuff differently. Sony has annual rebates for the bulk of their camera lineup every March. The A7III had $200 off as a "trade-in bonus" from Sony this year. In 2018, both the A9 and the recently released A7R3 were part of the program. They released the A7III as last year's rebates ended.