I have been tracking Target's Exclusive The Vintage Collection 3.75-Inch Millennium Falcon Smuggler's Run and The Black Series 6-Inch Captain Cardinal and DJ R-3X the past few days at Target.com since they sold out of preorders and they have been going up for preorder for the past few days in the early AM.
Times kind of vary. On Monday they went up at at about 3:10am CST and on Tuesday they went up at 1:45am CST. The figures only last for a few minutes (probably due to Bots) and the Falcon last for about 15 minutes or so.
Anyways I am not guaranteeing they will go up at these times, but if you are in need and up in the early AM, you may want to check.