Xbox 360 Hard drive

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So I got one of those refurbised Xbox's from Gamestop as a present, which would be fine, except for some reason it came with no Hard drive. I've been forced to use a USB drive that only holds 8gb until I can find one. I decided that I wanted a 120gb one, but all the stores I looked at sell it for about $100, which I don't think is worth it. Is there any place you know of that sells it for a little cheaper? like maybe $60 or less? I would prefer for it to be new, not used.