Keep in mind that those are rack rates. They have had one 25% off sale already, but it's over now. I just look at the rack rates for Couples San Souci for spring next year and an Ocean Vehandah is $898 per night. But, the special promotional price is $481 per night. It's fairly common for resorts in Jamaica to have very high rack rates and then deeply discount. 50% off is pretty common. No way we're spending $900 a night, but $450 a night is doable.

GLN's booking engine is actually showing "WINTER SAVINGS 50% OFF" right now, but does not seem to be applying it to the quoted rate. I'll bet if you called them you would probably get that rate.