Vacations to Go offers a Celebrity Cruises 6-Night Eastern Caribbean Cruise for Two with prices starting from $738. That's the lowest price we could find by $20, although we saw it for $40 less last week (since expired). This cruise aboard the Celebrity Summit departs Bayonne, NJ, on October 16 and includes stops in St. Maarten; St. Thomas, U.S. Virgin Islands; and San Juan, Puerto Rico. Book this travel deal by August 31.