$425 + shipping.
I have for sale a new pair of Trail Ridge (part #1AMRP01786) tow mirrors (these exact ones: https://www.1aauto.com/chevy-gmc-mirror-set-trail-ridge/i/1amrp01786). I got these from 1A auto and never installed due to various reasons.
They are power fold, heated, memory, power adjustable, puddle lamp, turn signal. They fit 2014 - 2018 1500's and 2015 - 2018 2500/3500's, but check their website for confirmation.
I only opened the box to take pictures, they are brand new and never installed. They sell for $620 new.
The package size is 33 lbs and 24" x 19" x 16" if you want to calculate shipping, ships from 82009. Would be willing to meet if you're located in northern CO or SE Wyoming.