What are some stores where I can buy cheap, normal clothes in Colorado?

I'm 12 years old (a girl) and I need to know where to buy some cheap normal clothes. I'm not obsessed with Abercrombie or Aeropostale or anything like that, I wear plaid shirts, normal graphic t-s and shorts. I don't have that many pieces of clothes I like, either my mom bought them without my permission, or clothes my grandma gives me. I have an allowence but right now only have 23 dollars. That's why I need to find clothes that are like $1 each or something. I have goon to Goodwill, and other thrift stores, but everything there that I like are way to big or small! I'm in CO so I need like Denver area stores, not stores in Vancuver or Pittsburgh! Thank you for the help!