Whats a good place INEXPENSIVE to hold a babyshower with about 80 people in Tampa, Fl?

Sorry, but NOBODY has 80 close and intimate friends who would expect to be invited to a baby shower. A baby shower isn't a wedding. It's a casual gathering for a few close friends.

Showers are normally held in the home of the hostess, and the guest-list is created to fit the space available, not the other way around.

If it's a very unusual situation (i.e. a workplace shower where all the co-workers are likely to attend, or a church group giving a shower for a very low-income congregant to help her out, then the workplace or church itself would likely have a suitable meeting room.