Some may recall the reports of an unmanned ketch found off the coast of Hawaii last year. After reseaching documented records, Hawaiian authorities located the American owner who had (obviously unecessarily) abandoned the boat off the Galapagos during a storm.
It consequently drifted for several months, covering well over 4,000 miles until called into the USCG by local fisherman. The boat was a Nauticat 33 (not unlike mine). This event is testimony to the vessels ability to stay afloat without a crew's assistance - amazingly, even with pilothouse doors and roof hatch open.
Not the "least expensive boat to make it to Hawaii", since new models could cost over $300,000, but the boat was essentially free salvage to anyone who could claim it.
However, some repairs are necessary - such as replacing the mizzen mast, perhaps sheared off from storms, along with a major cleanup of several hundred pounds of guano.
Here's a shot of True Blue . . .