I'm not sure if this is the right forum to post this, but...

I just bought a new bike this weekend. I checked the web site of the shop I bought it from, and the price listed is about $100 less than what I paid. Incidentally, this is a model of bike that was discontinued by the manufacturer in 2008. Should I go back to the shop to try to get the $100 back? Or, is it my fault for not checking the website first? Do bicycle purchases typically work like car purchases where you are expected to negotiate the price rather than just accepting their first offer?

thanks for any advice