Many online sellers provide free shipping for a minimum order of their products. This helps them attract buyers to purchase more items from their site and is also a great way by which you can save some more money on your diaper purchases. The minimum order is usually quite reasonable and can be easily met if you purchase in bulk or include other items in your order. So when purchasing diapers online, try to also prepare a list of other related baby items that you might need in the next few weeks and add them to your online cart. Always avoid single purchases so as to keep your shipping costs at a minimum or zero level.