Choice do Canon originals for £7.75, £9.99 for the black for some reason, perhaps its a high capacity cart? Prices include postage though but they don't have compatibles for this particular printer. Can't say I've tried Jettec carts so can't help there.
I get an email from them every 2 - 3 weeks offering me 10% off either paper or ink. Until April 14th enter code 041030 to get 10% off ink compatibles and originals. Also worth seeing what 7dayshop are selling but remember they add for P&P click here