What budget do you have?
IIRC, in my days as an employee, we paid £18k for Matthew Pincent for a Corporate event in 2006.
I went on a corporate do in 2006 at the Belfry where Pincent was the speaker. He was superb though and very inspirational, we all got a signed personised copy of his book after the event
For the evening do at the same event, the organisers paid 15K for Jasper Carrot
He was reasonably entertaining but only gave 45 minutes and was off
When we found out how much he cost we couldn’t believe it