I am selling a used, but boxed, white Nintendo DS Lite with a white SuperCard Lite, Superkey (it doesn't need to be flashed with this - and it isn't, so the warranty is valid) and a 1GB MicroSD Card. Also an official padded case worth around £15.
£150 including insured delivery. I'll also include a disc of ROMs (inc. 10s and 10s of recent games, inc. Brain Training, New Super Mario, Phoenix Wright, etc.). Of course, the disclaimer is that these ROMs should ONLY be used if you own the original cartridge :)