The best buys for a hair extension are under $20. You can have a synthetic hair extension style in straight and wavy or you could also have 100% human hair extension that resembles your own hair. Many people are having extensions because they are cheaper, affordable and easy to attach. Clip in hair extensions are the best way to add length and volume without causing harm to your own hair. Get more on http://www.hairextensions.com/ or from a hair stylist.