[FrankJ]

20 people is less than half the capacity for a coach bus. It is going to be expensive. Local knowledge is best. If your team is associated with a school, ask if the school has any policies. For example we are required to use approved charter companies. If available, the yellow bus (school bus) it potentially a lot cheaper.

If the distance to the tournament is far enough away that the bus stays with you the using it for local transport will be small or no additional fees. If it is a drop and return it will be lots more.