Reasonable price to have a Transmission Cooler Installed

[Off-Road Beaver]

Hello,
I'm looking to have a transmission cooler installed on my 2018 TRD Off-Road long bed. Wondering what a reasonable price would be to have it done at a shop before I start looking for quotes.

 

[tacojoel]

Thought all those 3.5 3rd gen auto tacoma's already have an external atf cooler....my 2020 has, as it comes as part of toyota's tow package.
Idk about the 2.7 version as they're not rated to tow as much to begin with.