Amazon must have a warehouse teeming with Childen of Mana shipments, as the online shop seems to have a sale on the game every other week. Square Enix's dungeon crawler has sold for less in the past, but today's $17.99 pricing is still a significant discount from it's regular $29.99 tag. This offer disappears tomorrow -- likely reappearing in a fortnight -- so don't wait too long to drop the game into your cart.
Play-Asia's Heroes of Mana sale will stick around until the end of the week, but there's no guarantee that the title will stay in stock. The Japanese text might be too much for first-time importers, but according to what we've heard, this RTS/RPG is a quality purchase. You can grab Heroes of Mana for $19.90, paying an extra $2.60 for shipping to the US.