This time, they seem to mean it.

marierutkoski:

A few days ago, I posted that The Winner’s Curse was available for $4.99 for the Kindle, and in about a few hours the price mysteriously went right back up. Well, I’ve no clue how these things work. But it seems that the discounted price is back again, and has been up there for about a day. No promises about how long it will last. But if you want it, go here.