I also use Amazon to order our wipes. This morning I scored a 720 count box (10 packs) for $9.29. So you end up paying about 93cents per pack and it is shipped to your door. The cool thing about Amazon Subscribe and Save is that you are under no obligation to keep it. If you get the first shipment and decide you don't want anymore, log into your account and cancel it.
See this post for Cheap Diaper FAQ.