Price will depend mainly on condition (been down, well taken care of, etc), then on mods (pipe, PC, levers?), then by location (places with more bikes like Southern California will have lower prices, because there's more bikes for sale) - I'm guessing the one you're looking at is completely stock ~ where do you live?
For a stock 08 CBR1000 around here, they're going for about the same as the other 08 literbikes, around $8000.
there is two on ebay one for 7500 one for 7800 both are out of warranty the 7800 was a track bike from Freddy Spencers track Expereance, it has 1200 miles on it, I drove 3 hours and passed on it, it has a 180 rear on it and some light cosmetic issues. there are some dealers out there selling a new 08 for 8900. I saw a red one last month for 8300.