That's a tough one. The correct answer is: as much as the market will bear. They are quite literally bears, no bull.
Most of my competition is $6 to $12. (taxes of 13% included) for a digital MM. I don't know of anyone locally still using mounts. I know some league bids that are $3. range or less. Yes, this is correct, not a typo or BS. I bid $3.75 years ago on a 3,000 player soccer league and I was way too high to be in the running.
Most of my leagues are $14 to $18., depending upon the sport/event and how much time is involved. ie. if I can shoot 700 kids in one session or if I have to come back time & again to do individual teams. All my MM's are created for each league with custom logo, team name, sponsor, player names, etc. That way I can justify the extra price and it's pretty automated with the right software.
The biggest problem I'm personally facing with sports is getting co-operation with convenors & coaches. They simply don't give a sh*t about handing out your info and if it doesn't get handed out, sales are so low, you might as well work at Tims.

We're down to handing them directly to coaches at the previous week's game. It's well worth the cost to hire a student with a car to do it. Even with that, a few forget to hand them out!!!
Doug