I subscribe to Frommers Budget Travel (www.frommers.com
) and have gotten some great deals from them.
The new issue ( just out last week ) lists a package to ambergris caye starting at $590 per person for r/t air from new york, 7 nights at tropica ( I stayed right next door at banana beach and loved the way tropica looked.. even had dinner there and it was good).
There are a bunch of add on airfares from other cities with the most expensive being $894 bucks from portland/seattle. $650 from Dallas, and $860 from LA. These prices are for travel from mid august to the end of september. For July 1 - Aug 15th, add 50 bucks per person.
the company that's offering this special is called capricorn ( no relation to the restaurant of the same name on AC) (800-) 426-6544.
Or just go to frommers.com and do a search under "belize"