How much do synthetic hair extensions cost (photos)?

Hi


So I want to get my hair extended (synthetic extensions), my hair is this length :


http://z.about.com/d/beauty/1/5/d/G/jess鈥?/a>





And I want to get it to this length:


http://smashingstyles.com/uploads/2008/1鈥?/a>





So how much will it cost?How much do synthetic hair extensions cost (photos)?
I bought mine that length. I paid 拢11 pounds for one, plus 拢3 for 3 clips.How much do synthetic hair extensions cost (photos)?
I do not know anything about extensions.
Hair extensions don't cost as much as people think! Go check out your high street you may be surprised...