Electroplankton and Monopoly / Battleship / etc DS are keeping their values, while Lost in Blue is back down, most likely because LiB 2 was so similar. In the last few months Advance Wars DS has been going for higher than retail, but it seems to have dropped down to more reasonable levels, although it still sometimes passes $40 on ebay. Monopoly / etc seems to have had a very very short shelf-life, and the more recent boardgame compilation released for the DS isn't liscensed by Atari, so I have a feeling that contract problems may be why this one is hard to find.