Thrift shops and good will and the ark! I got a pair of pants and shorts for under ten dollars!
Try second hand stores if you don't mind lightly used clothing. I figure I won't be in the clothes too long to really care so I got a few used pairs of capris.
Old navy! And I've actually found some decent pants and thrift stores
Target. Amazon, overstocked.com . I would not recommend shopping at pea in the pod because they are super expensive