I would guess somewhere around 300 to 400 dollars for the boat. The easiest way to track down the leaks it to put it on saw horses and fill with a couple inches of water. then lie under it and mark them with a pen. I would go to inflatable boatworks in ballard and get a the stuff you need to patch it. They will ask the year then set you in the right direction. ie chemicals to clean, something to scuff the site, the correct material and glue. They are constanly changing materials to something stronger or better.