I expect that most or maybe even all current Nikon deals, offers and rebates will expire at the end of this week as Nikon was pushing to generate some additional revenue before the end of their financial year ending on March 31st:
Nikon Z free FTZ adapter (more freebies available here)
First Nikon D850 price drop in the US
Nikon USA “Trade Up to Z” program
Nikon Z trade-in/trade-up event in Canada
10% off used DSLRs at WEX (ends this weekend)
See also the Nikon Z deals in Germany.