Recently there have been some reports from those booking through Hotwire and Priceline about space opening up in San Juan.
People have said they were able to get $70 for the Caribe Hilton on Hotwire.
Also, don't forget to sign up for the hotels frequent guest programs. Show your card at check-in and you may just be pleasantly surprised! While there may be notices everywhere that says hotel programs are not applicable to PL/HW bookings, I recently stayed at the Sheraton in d/t Miami and was upgraded to a corner balcony on the Starwood floor, just by showing my card at check-in. It never hurts