Waiting lists?

If a cabin type is sold out can one book for another but get on a waiting list for the other? It's my understanding that some suites are booked by those who might end up cancelling before final payment. Does one just need to monitor to see if a cabin class becomes available?

there are no waiting lists.

Ok. So, is the best way to see if anyone releases a suite is just to keep checking right around the time full payment is due?