It appears it took less than 2 hours for it to sell out, at 6:28 PM it was listed as out of stock, no back order, and next expected delivery is 2-25-2013.
I just got a back in stock email from Midway a little bit ago. More Winchester 45 ACP 230 Grain at Midway again today - $21.99 / 50 rounds and $219.99 / 500 rounds.