Where to sell my canon dslr 60d?

Because i want to buy nikon dslr.

You can sell it in craigslist.org

The big camera stores, like B&H Photo and Adorama, have used camera departments that will probably buy it. Also, if you've got a local camera shop, they will often purchase used gear.

Be aware that the price you get from a store will typically be less than the price you get selling through CraigsList. On the other hand, you don't have to deal with the CraigsList hassles.

Try for a coal sale first, Craigslist works but be careful to only meet in a public place to close any deals. Or try to sell it to someone taking a photo class at a local school. I have students always looking for good used camera.

Why bother? Changing systems is expensive and stupid.

If you can't shoot with a Canon, a Nikon won't do you any good anyway.

Follow Andrews advice