Latest update, from Caribe Tours (don't know whazzup w their site):
Bus from Santiago to La Vega,
Ticket price RD$150.00 USD $2.55
From 06:00 AM. onwards, every hour.
La Vega to Jarabacoa at:
09:00 a.m. - 10:30 a.m. - 11:30 a.m. - 01:00 p.m.
03:30 p.m. - 04:30 p.m. - 06:15 p.m. and 08:00 p.m...