What's the cost to change filter and transmission fluid on a 2011 Dodge Durango?

What is your question?

Dealer wants to charge me over 400 bucks to change the filter and the transmission fluid. My manual says it doesn't need to be changed on this engine until or after 100,000 miles, but the mechanic says it should be changed every 64,000 miles. I had a Chrysler Concorde that I drove for 442,000 miles before the transmission quit. Guess I could have gotten another 400,000 out of it if I would have changed the fluid every 25,000 miles like the companies on the internet say. but I figure it only cost me 1200 dollars to replace the transmission. If I would have kept changing the fluid and filter every 25,000 miles it would have cost me almost 7,000 dollars and if at 64,000 it would cost me 2762.50. So can anyone change my transmission fluid and filter for less than 400 bucks? If not, I will just keep driving it until the transmission drops. Then, get a used one from the junk yard cheap. Thanks