Here are a few examples of how much cash you can get for your used gear at Adorama (use this page to submit your trade-in request):
Sony A7R4: $2,000
Sony A73: $1,200
Nikon Z6: $900
Nikon Z7: $1,400
Nikon D850: $1,700
Fuji XT3: $600
Fuji Xt2: $400
Canon 5DM4: $1,200
Canon EOS R: $1,000
Please note that the exact value will depend on the condition of your camera. You can choose cash or direct trade-in options.