www.car-part.com
change it out yourself.
We replaced Steve (The Mayor) right before leaving for Moab in a day and he spent $700. It had the t-case attached as well, so BONUS.
You are looking for a 4L30E tranny. It can be from anything (VX, Trooper, Amigo, Rodeo, Rodeo Sport, Axiom) 97+.
The 4L30E is a POS GM product and those trannies FULLY bring the suck. I will most likely be in the market for one myself.
Take care,
Keith
Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup.