RPGamer has discovered that Electronics Boutique will be offering a special promotion to celebrate the release of Dragon Warrior 3 for the Game Boy Color. With the purchase of Dragon Warrior 3 at Electronics Boutique, customers will also receive a $5 coupon towards the purchase of Dragon Warrior 1+2, also for the GBC. Note that, as of this time, only the retail stores, not EB's online store, will be pursuing this promotion.
The promotion starts with the release of Dragon Warrior 3 on July 17th, so you'll have to wait until then to receive the coupon. With both games selling at $29.99, before discount, you owe it to yourself to to pick up Enix's excellent remakes of the first 3 entries in this classic series.