Besides the companies already suggested I'd like to suggest Escape Tours at 800-252-0775. This company is listed on www.frommers.com. at one of the top 28 consolidators in the country and HIGHLY recommended. I have used them for the past three years for traveling to Costa Rica, beating supersaver fares by $300 or more easily every year. Going to AC from Philadelphia for $500 on June 14 returning June 22. Have NEVER had a problem with them. Just have your dates in mind and ask for their prices when you call. Fridays, Saturdays, and Sundays are always about $50 more. Flights are usually on Continental through Houston. If your dates are sold out with Escape tours try Solar Tours 800-388-7652, they are usually about $40 more then Escape tours. Both companies are located in the U.S. but employee people that are fluent in Spanish and are from Central and South American for the most part. They are sometimes diffcult for us Norte Americanos to understand. Just ask them to repeat something if you don't understand them, they are extremely friendly and helpful. But they are direct and to the point since they sell on quantity.