I commute around 20 miles a day coming and going from my campus... or did, until the cold set in. I always changed my shirt since that's quick and easy but I like to keep the same pair of shorts/pants.

These Rapha trousers are exactly what I want but I'm not paying 140 bucks for them, especially since I'll need a few pairs. Has anyone noticed anything similar? Much cheaper? Durability is also an important feature, I like having a lot of shirts but typically only own 2 or 3 pairs of pants at a time and wash regularly.