I have the same feeling about the Midnight Maddness. It already seems that some figures have become pegwarmers on EBAY and they haven't even been offically releasesd. I too most likely wait till the end of the week to search for new stuff. I have a feeling most items will be easy to come by.
I did find a box of the EP II Slave 1 at K Mart in Northren VA today. The Kmart in the Sully Plaza off of RTE 50 had them sitting on a toy skid in the toy dept.