Transmission replacement cost?? on 2001 Chevrolet Monte Carlo

Going forward, won't downshift into low when stopping. Acts like stuck in 'drive'. Won't shift into reverse at all.

Asked by for the 2001 Chevrolet Monte Carlo
Instead of replacing trans, take it in for an inspection first.
Will have to have it towed, no matter where I take it. Just trying to decide where to take it. Dealer is talking $1200(pressure control)-$3200(rebuilt trans) to fix. Thanks