I order canned cat food through PetFlow.com. They have a reoccurring subscription service, and orders over $49 have automatic free shipping. They also do a lot of supercheap sample deals (I've gotten 5lb TOTW samples for <$2 before), and bully sticks are available for dirt cheap (typically $.99ea, sometimes even cheaper).
I haven't ordered kibble through them, just because it's the same price as my local store, and my store is seriously easy to get to. Canned food, though, I often have issues getting locally and PetFlow has never failed me. Two cases of 13oz cans plus five bully sticks costs me a little less than $53, free shipping, and it's delivered to my door every 10 weeks.
It's also really easy to adjust orders with them. For example, if I needed to change delivery from every 10wks to 8wks, super simple. They also give you an email about a week before a scheduled delivery as a reminder, in case you want to postpone shipment or add something to your order.
~ Cynthia ~