I just booked a premium through Alamo from 8/29-9/6 for $240 through the Alamo site. I used the Costco AD2338FDF and 7014627 (either Southwest or Visa I forgot). Best deal I have seen for awhile, but as always will continue checking.
Aaarrgggh, those codes took me to the $290 range for my rental -- which is about $160 more than I have now....just goes to show...