Insurance for youth basketball teams/national affiliation

I am a coach of a travelling 3rd grade team in Iowa. We have just started getting into playing tournaments and scrimmage games at area high schools, working with other coaches. It has worked out well. I recently ran into a snag when we were trying to play at an area high school. They requested that we have insurance. I am somewhat familiar with this, my boys also play baseball and are affiliated with USSSA and they have a nice insurance policy.

My question is this: does anyone know of a national affiliation or maybe even an Iowa affiliation where we can get some team insurance? Has anyone else coaching youth teams ran into this issue?

I was looking at joining USSSA for basketball, but noticed they don't have much for tournaments for basketball in Iowa.

Any ideas??

Thanks.

Chad

AAU and USBA both offer insurance with membership.