I saw this posted on Clark Howard's website. Around $360 for RT to San Jose from Atlanta...Not sure how long
it will last. And it is on American Airlines
http://www.clarkhoward.com/travel/atlanta-travel-deals/Here's the fine details
NEW!EVEN LOWER! Purchase these round-trip rates through September 16:
$346.90 Managua, Nicaragua ($72)
$353.31 San Jose, Costa Rica ($96)
$356.40 Panama City, Panama ($82)
$365.03 San Salvador, El Salvador ($96)
$375.03 Guatemala City, Guatemala ($106)
$409.90 Tegucigalpa, Honduras ($178)
$439.15 Belize City, Belize ($168)
$543.49 Liberia, Costa Rica ($288)
Start travel on or after October 31. Complete travel by February 21, 2013. Add $10 per direction for Friday-Sunday travel. Stay 3-90 days. Blackouts: December 15-28 south; December 28-January 9, 2013 north. Valid on American via Miami or Dallas.