How much is this bike worth

Need advice on how much this bike is worth used. Can't find it online anywhere.

Bike description:
Cannondale R600 with CAAD4 aluminum frame and slice prodigy carbon fork

It is equipped with a Shimano drivetrain, including a Shimano 105 rear derailleur and Tiagra front derailleur, along with a Cannondale Expert crankset and durable Bontrager tires