How can I save money on disposable diapers?

I pay $15 for one pack of Pampers Diapers which lasts me maybe 4 days. I'm on a pretty tight budget and I'm thinking of ways to save money. Diapers take up a big chunk of that budget. How can I save money on Pampers Diapers?<br><br>Edit: disposable can not be an option. I personally use disposable diapers.<br><br>Edit2: I have hard time with absorbing leaks. Diapers tear down at the elastic area. I'm thinking to buy bigger size but it costs more and I dont know if it will work. I use size 1 for my 3 month old baby girl. <br><br>Update: I have used the diapers on 7pm today and she woke up at 8am dry. No wetting, no tear downs, no leaks.