Ah, so you paid much less than the MSRP, but you feel it wasn't enough of a discount? Did you feel the price was fair when you bought the bike? Any way to tell if the price was lowered on the website after you purchased? Are you sure it's the exact same bike?

Bike pricing is often based upon what the dealer paid for it to the manufacturer. If it was purchased in 2008 for X amount of dollars, X amount of margin is added to the price. If the manufacturer is closing 2008 bikes out for X price to the dealers this year, they add X amount of margin and come up with the price you pay. The closeout may very well be on specific sizes that are left in the warehouse. Also, if a dealer is closing out 2008 bikes, often it is at their cost just to recoup capital.

Of course you are fully welcome to go down there and demand your $100. You may become "that guy" in the process though.