I have posted couple sites, that I use for baseball games at work.
Hope this will help you in your search for both Minor and Major League Baseball.
Great sites are www.radiolocator.com just put the radio call letters in the box and hit search.
other one is new to me it is www.thegamelive.com , this site gave me the Bats game with Syracuse broadcasting team. I like listen to other team broadcasting cause they give opposite view what magangement or organzation wants you to know about there teams.