Personally, I would not buy a bayliner anything, but I am sure there are many on ifishthat would disagree. First, you are going to need to post more info on this boat. what kind of motors? How many hours? moored in salt? what kind of trailer? any electronics (although this should not reflect in the purchase price)? How much?
If you are serious then you need to go to
www.nada.com and find out the value of the boat and motors. You will need to call a trailer dealer that has whatever brand of trailer it is to find a resale price. Next, If everything up to this point checks out then get the boat into a mechanic to do a marine inspection on the boat and motors.