There seems to be plenty of offers on the 3DS at the moment, but this is perhaps the best to date?
HMV are doing it for £170 when bought with a game for £34.99. Unfortunately the games are limited to either; Ghost Recon, Spliner Cell or Rayman but there aren't that many killer titles are present so its not a major restricyion! That takes it to £204.99 but use code 5OFFHMV40 to bring it down to just under £200. When you take into account Quidco & HMV's "Pure" loyalty scheme aswell it seems pretty reasonable to me!