If you are comfortable getting flagship cameras as imported grey-marked, among the latest eBay Deals, seller GetItDigital (99.6%) is offering the new condition imported grey market Canon 1D X body only for $4000 with free shipping and $80 eBay Bucks (if you are a member of ebay’s free rewards program). Limit 5 per customer. Over 230 units sold from this listing. Again, note this is imported, the one year warranty is provided by the seller GetItDigital, not Canon USA!
At authorized Canon dealers, this goes for $5300 but you get some free accessories. For example at Adorama you get a free 128GB CompactFlash and two extra batteries, while at B&H Photo you get a different set of freebies. You also get 2% promotional rewards (=$106~).
If you don’t hate mail-in rebates, Adorama has the usual 1D X Pixma Pro 100 bundle with the usual extras for $5300 after $250 MIR (prepaid AMEX gift card, not check).
Amazon itself is stingy on the freebies, but if you qualify for their Store Credit Card (not the Chase VISA), you can get a 12-month 0% APR financing (you have to make equal installment payments and pay in full by the end of the 12 months in order to avoid interest. They have long Terms and Conditions.
So the trade-offs is $4000 without Canon USA warranty vs $5300 with Canon USA warranty and extra accessories or financing.