If you can make your way to where the boat is (Europe or the Caribbean, usually), this company is always looking for crew:
Reliance Yachts Crew Vacancies Several of the current openings are trans-atlantic.
I crewed for them on a delivery across the Mediterranean and a shorter hop across the northern bits of Germany. Usually the skipper pays for all meals, so your only expenses are (part of) your transportation to and from the boat.
- Will