Since you get 30 free songs with the purchase, it means that the value of the AirPort Express unit is $99.30 now instead of $129.00. Because of this as soon as this free songs deal is off the price will easily go down to $99.00.
Since this link (http://store.apple.com/1-800-MY-APP...?promo=AirPortExpressiTunes&cid=AOS1000brick1) says that the deal is off on next Monday expect a price drop on the AirPort Express and new AirPort units to come out as rumored next Tuesday.
Airport Rumor Article 1: https://www.macrumors.com/pages/2005/05/20050516163917.shtml
Airport Rumor Article 2: https://www.macrumors.com/pages/2005/05/20050516165156.shtml
Since this link (http://store.apple.com/1-800-MY-APP...?promo=AirPortExpressiTunes&cid=AOS1000brick1) says that the deal is off on next Monday expect a price drop on the AirPort Express and new AirPort units to come out as rumored next Tuesday.
Airport Rumor Article 1: https://www.macrumors.com/pages/2005/05/20050516163917.shtml
Airport Rumor Article 2: https://www.macrumors.com/pages/2005/05/20050516165156.shtml