I was able to find two that appear to be a fit for what you are looking for.

Western Michigan offers Volleyball camps http://www.wmubroncos.com/evt/Event.dbml?DB_OEM_ID=4600&_MODE_=LIST&CATEGORY=38 - Cost varies

If you want to travel a bit -Michigan State has a nice breakdown depending on what you want to focus on. http://spartanyouth.msu.edu/Resource.aspx?ResourceID=69 - These start July 16th

Hope you are able to get into one.

I would look into the CourtHouse too.