There’s no price listed but I read on another site that the Regular edition will be $29.99 and the Collector’s Edition will be $34.99. So after voucher the game would be around $23.45.
The game uses Steamworks, so you’ll have to activate it on Steam. This game took forever to come to PC so another option would be to wait for it to go on sale for $5.
Alan Wake unlocks on Steam in 3 hours!