eBay (via 6ave) has the Canon 5DS for $1655.41 (compare at $3499) in limited quantity. Check it out while it lasts here on eBay.
Note, this appears to be a gray market camera. eBay seller 6ave has a positive feedback rating of 99.6% at the time of this post.
This is an awesome deal! If I wasn’t saving for Canon’s next mirrorless (which will hopefully have dual cards), I would absolutely get this!