What store or place can I go 2 buy skinny jeans for girls 12 years old and the price is under $20 and the skinny jeans are beautiful and the skinny jeans must be very skinny on the waist and legs!!

I don't know if you're in the United States or not, but if you are try
JCPenney or Target.

JCPenney department (http://www.jcpenney.com/jcp/levis.aspx?)

http://www.target.com/Pants-Jeans-Juniors-Women/b/ref=sc_fe_l_2/192-4287049-4031919?ie=UTF8&node=13890691

Try Ross Dress For Less