This product is at an excellent price, with the next lowest price in the UK being double the price elsewhere.
You should also receive 11% cashback from Game because it's a software purchase but in the direct link I've supplied, it goes through the Hardware section, so it may give you 3% cashback.
If you have a reward card, you'll also receive 2.5% back in reward points too, so it makes it excellent value all round.
*IMPORTANT!!! Please note, the version that I've listed only works for the Original Nintendo DS, there's also the Nintendo DS Lite version available but it's currently out of stock.
** Don't forget that if you also add another £18.01 to your order, you'll receive £3 via a voucher, so checkout other deals around as well.
Hope that helps. :)