Nisos Agios Efstratios Transportation
An alternative -)
Well, the boat's schedule is not the best you can find. There are no everyday transfers, so you have to prepare an accomodation there. Alternatively you can use the transportation type depicted on the photo, but I guess you won't find it convenient for your budget. -))) "Rent a helicopter" service is provided from Athens, and I estimate it will cost you as a Paris-N.Y. ticket.