www.CostaRicaTicas.com

Airlines and hotels have been working hard to restrict your using online travel comparo and booking sites. Frontier is only the latest; maybe booking directly isn't so bad:
http://www.nytimes.com/2012/09/30/trave ... ource.html
However with air fares, here's another way of finding out at least the lowest published fare:
http://flightfox.com/

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"A man accustomed to hear only the echo of his own sentiments, soon bars all the common avenues of delight, and has no part in the general gratification of mankind"--Dr. Johnson
"Amen, brother"-ED

tried it, after entering in my flight infor, they was 3 sets of fees depending on the level of help you would like.

bailed once I saw fees

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My best friend was the clock on the wall, and he turned out not to be much of a friend in the end