I would need a bit more information to answer that. And the estimate is what it would bring here in Kentucky as that is what I am familiar with.

I would check the local craigslist and other local on-line sales sites, and try to find something similar.

One very important thing you need to check - if your state requires a title make sure the seller has one. Here in KY there are a lot of boats for sale without one and while not impossible to get one it is a long drawn out process and often not worth the time, effort and money to do so.