Some years back I found some house brand tights wandering through REI. These had a water-resistant layer on the front of the thighs that seals off the wind, and reasonably thick pile on the rear and the calf. These are my go-to tights below 20F.
I'm not sure these are the same thing:
https://www.rei.com/product/157092/r...ing-pants-mens but it's in the same ballpark, price-wise. Pearl Izumi and/or Sugoi probably have something similar for 2-3X the price.