The Nikon instant rebates in the US will be extended again, but as expected this time they will exclude all pro DSLR bodies and lenses produced in Japan (the D300s is produced in Thailand):
The different body+lens combinations will save you up to $200 (compared to $400 before). The new Nikon instant rebates program will run from March 27 – April 30, 2011. I will post the detailed combination break down on Monday.