Transmission information....?

I have a 1994 Pontiac Grand Am SE, it has the 3.1L V6 engine and 4 speed automatic transmission w/overdrive.....about how much would it cost to pull it and rebuild it and put it back in? i want to make sure i dont get way over-charged, i know prices vary all over the place but if theres a 1000 dollar difference then ill look elsewhere for another transmission garage....id even appreciate a mechanic to answer my question based on past expierence or his own price on it.... thank you