Old jeans, denim, or work pants (Santa Rosa)

Looking for used/old jeans, denim, duck canvas, work pants, or bibs. Preferably adult sizes so I have enough material to work with. I’m looking to sew my toddler son pants (picture included so you have an idea of what I’m looking for). Located in Santa Rosa. Can travel anywhere in Sonoma County depending on quantity receiving and location. Can travel as far south as central Marin easily as I travel down the 101 corridor three times a week.