Robert Orben and Pricing
Robert Orben is a prolific American gag and speechwriter. I've bought a copy of one of his gag collections and it was very out-of-date, but his recent publication is The Speechwriter's Handbook of Humor is excellent.
He's particularly good on pricing, which is always a thorny subject. If I'm a speechwriter with nearly ten years' experience and I'm working exclusively for you, it's going to be quite expensive. Thousands of weddings every year are marred by vulgar speeches, hundreds of hours of worktime are wasted in boring presentations, you're not just paying for a script, you're getting a dose of reassurance and consultancy on top.
On average once a month I get an enquiry about how to become a speechwriter. I recommend this book along with Bob Monkhouse's Complete Speaker's Handbook.