i had similar black and blonde real extensions they was £160 for the half head.
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before that i also had fake ones in white and purple they was about £5 each
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are you keeping your normal hair with some blonde added? or are you having some extensions in your own hair colour and blonde aswell?
have you enquired(sp?)into if they do blonde fake extensions :s the fake ones i chose from were fake colours like the white,pink,yellow,green....