Horizon in Antigua does this and I believe charges $700 for the one way, which is a bargain. It is a slog heading back to Antigua, but very easy going the other way. Very easy to to Antigua, Barbuda, St Barths and St Martin, but you will be rushed every stop as you will lose time sailing between. It is 4-5 ANU to Barbuda, 8 hours Barbuda to St Barth etc. I would always leave Barbuda at Midnight to arrive first light at St Barths. Horizon allows night time passagemaking.