Marlin 30-30 gun value

Its a Marlin 30-30 model 336 CS Micro Groove barrel CAL 30/30 WIN its says on barrel. It also the The Marlin Firearms Co. It has a Holden Ironsighter scope on it. It also has a Torrel Cowhide strap on it. Please tell me the value. Dad told me to take no less than 300. Please I am thinking about selling it! thanks