Amazon offers Prime members Dishonored: Game of the Year Edition for Windows for $7.97 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping adds $4.98. GameStop offers it for the same via pickup.) That's tied with our March mention and the lowest total price we could find by $12.
Update: Note that it's temporarily out of stock at Amazon, however it can still be ordered at this price for delivery when available.