KEH, a reputable used dealer in the United States has two copies of used Canon EOS R5 bodies. Both are highly rated for their condition and ready to ship.
Canon EOS R5 body $3699 (LN- Condition)
Canon EOS R5 body $3799 (LN Condition)
Warranty wise, these cameras will both come with a 180-day KEH warranty. They also include all of the accessories that you’d expect with the EOS R5.