T.C.
I'm in NorthShore. I dont have the schedule in front of me. But check into the Wendell Ley YMCA. They have a ton of classes all day and some in the evenings. A single membership is $44. Also look into the Community Centers off Freeport and the one off DeZavala.
http://www.co.harris.tx.us/comm_garcia/CommunityCenters.aspx
Check out this link. Its to their master list of community centers in the immediate area. And they offer aerobics classes.
If you are interested in joining the YMCA, I need a buddy. Joined almost 2 months ago and I cant get out of the house with enough energy to go.
Good Luck! Hope this info helps.