What’s the minimum the Spurs should accept for Josh Richardson?

The NBA trade deadline is less than a month away. San Antonio Spurs could be trading Josh Richardson. The team is seeking a first-round pick in return for him. Richardson was acquired from the Boston Celtics at the trade window last season. He is on an expiring contract and doesn't project to have a future with the Spurs. The Spurs are playing with found money because Richardson's contract was a throw-in in the Derrick White trade. They are waiting for another big deal to see if they can get another asset as a byproduct of that deal. If they get something that they could spin into a long-term piece, that would be a win for the team's rebuild.