Amazon.com has pontoon boats for sale. You can shop online and choose the kind of boat you wanted to have, the size because its where the prices matters too.

Yes, there are websites that you can go to in order to sell your pontoon boat. I would suggest Craigslist, EBay, or Amazon. These are all reliable sites.

A pontoon boat does not normally sink. The cause of a pontoon boat sinking is damaged tubes. If a pontoon would hit something very hard it could cause the tubes to be damaged and fill with water. This may cause the boat to sink.

Pontoons are not pressurizes just water tight

yes