According to Xbox Circle, a DS Lite nets a 18,000¥ (about $160) trade-in value at Enterking, a Japanese gaming retail chain. That's about $10 more than its MSRP (16,800¥) and roughly $25 more than the trade-in value of an Xbox 360, which Enterking lists at 15,000¥ (about $135).

http://www.joystiq.com/2006/05/23/ds-lite-...value-in-japan/