Use code 20OFFGAMES-1 for this price.
You can also use code CCPOINTSFEB25-1 for 250 extra Clubcard points if buying for more then £25.
Standard price (bought in Wii or DSi shop) is £27 for DSi points and £21 for Wii points. So for DSi is almost a third off! I think this is the best deal you can get for Nintendo points as there are rarely any deals for them. Great if you want to buy some DSiWare or WiiWare titles or a good idea for a gift to a Nintendo fan.
You can also buy 1000 points for £7.18 and 2000 points for £13.98. Don't forget to use Quidco! :-)
This is my first deal posted so please be merciful. :-P