I don't know if they are exactly the same as the ones you want, but Costco has Dockers khakis for about $25. Still a bit on the expensive side, but there is such a thing as quality, and they do last a good while. They also sell their store-brand ones for about $15-$20, which work for me any way. I've tried thrift stores, but apparently I am unusually shaped, because I rarely find anything that will even vaguely fit me.