Just saw this on yakface.com:

[font=Arial,Helvetica,sans-serif]It looks like on May 23, shop.starwars.com will be selling more CIII Vaders but only to Hyperspace members… so those who weren't able to pick them up during previous releases, this might be your last chance to buy them at a reasonable (non-ebay/scalper) price. The link to the store is not yet active, but check back throughout the day there so you don't miss it.