Try
www.nwgabaseball.org. Go to the discussion forum and you will see teams who are looking for additional players. They also post open tryouts or teams looking for additional players for individual tournaments. It is a non-profit organization of teams that play each other and are located primarily in the northwest georgia/atlanta area. One of our local middle schools does not have a school baseball team and instead most of the kids play through this organization to prepare for high school ball which is how I became familiar with it. It may not be close enough to where you live but thought you might want to check it out. Good luck!