i bought my tickets for this summer a couple of weeks ago. i purchased then because the availability of seats was going down. the day i had originally planned to leave had been completely booked since i checked a few weeks earlier! i am paying $577 RT thru houston on continental.
i have an excellent ticket consolidator/travel agent who seems to specialize in central american countries. she's in sf--ana adams at imperial travel 415.826.8100. the price she quoted me this year was $570...about $40 more than i paid last year. however, last year i contacted continental after i made my reservation with ana and a seat on the exact same flight booked thru continental reservations was going for about $250 more! i wish i had the guts of steel to try for last minute cheap seats, maybe that works for people, but i have a need to have certain aspects of my trip assured in advance. i am not sure if ana can hook folks all over the country up with deals but it doesn't hurt to try her if you are planning for an extended summer trip this year and finding the prices steep...