If your in Baltimore, I suggest going to the library. The one On Kennwood Ave in Rosedale had a storyville that has a baby section if they cant walk well, and a really fun section with all types of different stuff. and all of the branches in the area offer free story times for baby and kids. You could do 1 or 2 of those per week, go to storyville, ect. And not pay anything.
We did My Gym and I think it was $75 per month for 1 class per week plus unlimited open gym sessions. There are plenty of free activities as well at libraries, etc.
Re: How much would you pay?