it's worth a try.
some agents like orange vacations will book up a group of rooms to see with their packages for universal.
when they eventually know they are not going to sell them to their clients, they release the block of rooms back to the hotel.
to avoid charges, if you have reserved a room and cancel it before 5 days out of arrival, you get the deposit refunded.
many rooms can show up 6 days out of your vacation or earlier.