The authorized Nikon dealer BuyDig is currently selling refurbished Nikon D500 cameras for $1,446.95 with coupon code DXPRO2X50 (limited quantity available, limit 1 camera per order, free shipping, 45-day return policy, 90 days Nikon USA warranty). For comparison, a new Nikon D500 body now costs $1,796.95 and comes with a free grip and accessories valued at $481.39 (the Nikon MB-D17 grip alone costs $371.49).
A list of all BuyDig coupon codes is available here.