I get a weekly delivery from Tesco, initially for Cat food and Cat litter plus gallons of Pepsi Max for me.
Cat little bags are a nightmare to carry, and like Jackthehat my two only like Tesco low dust litter.
Now that they are older and on a Chronic Kidney Disease diet (not available in the supermarket) I have to get that from another source. The last load cost £90, and they are refusing to actually eat the stuff.