Where can i get the bluebook value for my car?

Where can I get the kelly bluebook value for my car or close. I am located in CT and I own a nissan altima 2006 and has 66800 miles on it it is in good condition I bought it from the dealership not too long ago. I would like to resell the car within the year for a decent price and get another car. the KBB value is listed at $10,790.