Group Travel Organizers, can you please help?

This is actually easier than a full blown trip out of the state or country. I just want to transport about 25-50 people from Cincinnati, Ohio to Mansfield, Ohio. (By car this is a 3 hour drive) I've looked into Charter Buses and it's around $1700- $1900. That price is set in stone no matter how many people go. So, my question is, what is the least expensive, but still comfortable mode of transportation to get this group where we need to go? Are there smaller busses for around 20 people that maybe I've missed? Most of the charter companies wanted to charge me the cost of the bus, plus the driver's hotel stay. If this pricing sounds right please let me know that too. I'm new to all this!! Thank you!