My Social Sports runs indoor and outdoor leagues that are pretty well organized and cost, at least when I played, about 10 bucks a game per session of 8-10 games. I played in the Manchester league where the outdoor games were in Bedford and the indoor games were Deerfield. There is also Sportsplex in Bedford that runs indoors leagues yearround, they have good indoor fields and a bar inside the facility for post-game pitchers. Derry Sportszone has a league but I am led to believe if is more competitive.

http://www.mysocialsports.com/

https://www.nhsportsplex.com/