It has been a long time since Nikon had lens rebates that were not tied to a DSLR bundle purchase. These current Nikon lens rebates expire Saturday, March 30.
Check them out before they are over here at B&H Photo.
B&H has the Canon 6D for $1,999 (reg. $2,099) and the Canon 6D kit with EF 24-105mm f/4L IS zoom lens for $2,499 (reg. $2,899). Both Canon 6D options include a Lowepro camera bag and a Transcend 32GB SDHC card. Check them out at the links below.