Try doing it yourself it's dead easy. Buy a new shell off E-Bay for around £7 and follow this guide: http://site.powergamingparts.com/RepairNDS.html
I can do it for you if you wish but will involve you paying postage each way - recorded delivery =£2.64
Will do it for £25 including the new shell in the colour of your choice (red, black, pink, dark blue, turquoise blue, silver) can normally turn it round in a couple of days once I've purchased the shell. just let me know the colour you want and I'll let you know when to send it.
For more info or any more help e-mail me jonashuk@aol.com
Jon
Jon Nash, March 2008