Here's a good price for a new copy of Guitar Hero 1 & 2
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From the site:

FeaturesIncludes Guitar Hero and Guitar Hero IIGuitar Hero supplies four difficulty levels, eight awesome characters and six wild venuesFeatures more than 30 rockin' tracks, including Bark at the Moon, You've Got Another Thing Coming, Spanish Castle Magic and Ace of SpadesGuitar Hero II lets you tighten up your skills before stepping out in front of a crowd with the all-n...