Airfare watch sites and Savings calculators

Airfare watch sites and Savings calculators

I know some of you watch flight prices...what sites do you find the best? I've looked at the big three: priceline, travelocity, orbitz several times. Do you use any of the fare alerts that some sites have? Recommendations?
I am looking for flights to the west coast as well as flight to Costa Rica (Martin air seems to be the lowest cost fares From Florida to Costa Rica.) Thanks for any tips you have. Cheers!

Looking at:

Florida (Tampa, Orlando, Miami) to Costa Rica (San Jose)
Florida (Tampa) to California (mid way between LA and San Fran is my ultimate destination)
California to Costa Rica
Also, have you found any calculators online that you'd recommend for planning savings towards a specific goal? I have very little extra money a month, but would like to start socking some away to eventually visit loved ones in Costa Rica. I'd love a planning calculator to play with the numbers..."If I save x amount each month I'd reach my goal by x date" type thing. Thanks in advance and Be well!
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