We have used Cheapcaribbean.com and found the prices seem to be lower than most other package deals, at least out of LA. We usually just take a taxi both ways and usually you can find someone leaving at the same time so it lowers cost even more!
I used bookit.com and got an ocean view for $1400 for the two of us for 7 days at TTR for our January 2012 trip. I've noticed that the price fluctuates. Sometimes when I check the price is much higher. You just have to wait for the price to come down again.
Expedia was $100 lower than CheapCarribean - same flight, same 8 night stay in April and that was after using the coupon code on CheapCarribean. The hotel was a bargain - the flight not so much but 3hr flight time with no layovers on Alaska Airlines flying out of SFO, worth the convenience for a few extra bucks. Virgin Air was ridiculous - they wanted almost $650 a person for the direct flight.
Expedia was $2600 out of edmonton,could have gotten it a little cheaper through other sites but the flights sucked,we didn't want to be on a milk run. It is still pricier than most of what we've seen posted on here but thats because they hit us hard here in northern AB J&B
