The Trigem Lluon Mobbit MID that I had a favorable encounter with at CES went on sale this week in Korea as part of a special event that someone who reads Korean needs to explain to me. I'm not sure what accounts for the 100,000 KRW (~$72) price difference shown in the image (original here), but ~$504 and ~$577 are both great prices for what you're getting in that glossy 13.2-ounce package: Windows XP, 1.33GHz Intel Atom Z520 CPU, 1GB of RAM, 4.8-inch WSVGA touchscreen, 2-megapixel camera, WiFi, Bluetooth, and WiBro.
Update: Thanks to Sam in the comments, it turns out that the 699,000 KRW is the "subsidized" price of the Lluon Mobbit when purchased with an 18-month WiBro contract. Both prices are part of a 150-unit presale promotion, so it's unclear whether the units will still cost the same when they officially go on sale.
Full specs and more details about the Lluon Mobbit in Pocketables Products.