Dex VI at Walmart is about as inexpensive as it gets. And I've been using it in my old BMW for nearly 100,000 miles now with no issues. By the way, there is no more Dex III anymore, at least not licensed so that's not technically what you're buying. "Suitable for" or some other such statement but it has been superseded by Dex VI.
But if you are stuck on "Dex III" then Walmart is the place to get it.
Originally Posted By: sprite1741
Thanks for the replies. As far as Dex 6, I never use synthetics and have never had transmission or engine problems. I change my trans fluid every 2 years and the filter every 4. The cheap stuff is fine. No sense dumping expensive fluid, and I don't believe in running FWD trans with extended drain. My Dodge 3 speed is original and runs Dex 3, never rebuilt except I added Gunk Transmedic 9 years ago at 230k when it started slipping a little in the morning cold. Been perfect ever since. Has almost 300k miles on it now. As far as Dex 6, I don't need it. The 4t65e takes just under 7 qts if I change via the dipstick tube, 7.5 when I drop the pan.