In my region, Long Island, NY, there has been a rash of counterfeit bills going around. So, I would be a bit hesitant.
If you can persuade them to send funds via Paypal or Venmo, or Wire, it would probably be safer. Given that the buyer has no feedback also makes me more cautious.
Can you Google his business and see if he actually owns it?
Or, perhaps you can request a reference? I did this many times when I was buying watches.
Bob