How much pay for a BPO?

[Henley H.]

I'm looking at a pocket listing to potentially purchase and flip.  I have my own idea of what I think the the value of the property would be post improvements, but would like to consult with a local realtor for a second opinion.

I've elected not to sign any type of agreement with a local realtor, though I have put a backup offer on another home recently with the listing agent.  I would like to ask him to do the broker price opinion for this new potential flip-  He is aware I don't plan to sign an agreement, so doesn't have the incentive of a commission down the line, but I would like to be fair an compensate him for his time and efforts.  I know it's unorthodox to pay for a bpo, but given the circumstances and wanting to be respectful of his time, how much do you think would be fair to offer to compensate them for the bpo?