Welcome, lakewiew; and hello choochella,
I also have been signed up for the stand-by program for some time and never received any last minute offers. We too get specials several months out, and once I received an e-mail offer at about a month out, but there was no indication it was part of the stand-by program. I also would love to hear from someone who actually got a last minute (like 2-3 weeks) offer.
Even if they always sold out you would think there would be a few cancellations--or maybe we're just not far enough up the priority ladder.