I hope you didn't buy a stolen bike, because it's worth more than $100, even now after years of depreciation. It appears to be a 2003 model or thereabouts. To get a fair assessment of value, you'll need to provide a bit more info like component specifics. Pics from the drive side of the bike would help. And your location is important because the same bike could sell for more or less depending on where you are.

As mentioned above, there's a 'classic & vintage appraisal' forum on this site, but this bike's too new for the C&V crowd.