Cheaper yachts really don't cost that much though. Very wide range of prices and sizes. Pretty much any recreational boat with a cabin.

There are some decaying around here. I would be kinda interested in salvaging one but maritime salvage laws are lame and I don't want to take one that isn't actually abandoned that looks like it might be. By the time its very obvious it is abandoned it is a bit too damaged and overgrown with seaweed.

Also I don't really know much about using something larger than a kayak.