Normally just go to supermarket or garden centre. But, I'm sans car, and the unfillable furbag goes through nearly 2 boxes a week. She eats more than I do.
Catfood is something a bit bulky and heavy to transport on a bike!
So I thought I'd order a big bulk delivery online.
Erm, what! Prices vary between 70p more per box than Tescos to £2 per box more!
[edit]
I've ordered from Zooplus, and in doing so, worked out that it costs as much to fill the kitten as it does to fill the car.