That's a good find - beats 7 dayshop by a few quid (every little helps!).
pj123, "7dayshop prices seem to be a lot higher than Cartex prices" - not for carts. for the Canon Pixma 4200. I think their delivery charge of £7.99 lets them down. I have just priced up one of each cart. and the total payable for each supplier:
Inkraider £40.82 (inc. del. £2.99) 7 dayshop £44.56 (inc del. £3.95) Cartex £ 48.74 (inc.del. £7.99)