Thanks to scotty0036 for posting the DSTT earlier.
I think that this card is worth paying the extra few pounds for.
This card allows you to play "Home brew" games on your Nintendo DS, and DS lite.
You can also listen to MP3 songs, and watch films.
It is compatible with SDHC Micro SD cards, so you can easily have 100 games on a single 4gb micro SD card.
If buying 3 or more, add BULKRATE in the voucher box to get a litlle discount.
Dealextreme are based in China.
Dealextreme can range from being extremely quick for orders, to extremely slow.
I have ordered things, and received them less than a week later, and other things have taken months.
No cashback available from Deal Extreme as far as I know.
Dealextreme accept payment by Paypal.