With multiples, or multiple children in diapers, pay full price for one and get a 50% discount on each additional child. You will receive double the amount of diapers, soakers and wipes.
As for diaper pails, if you're always changing in one area, you can get away with one diaper pail. Just take the first bag out of the pail and store the diapers in the garage or another safe (and cool) place. Then start a new bag. For others, it will be far more convenient to have two diaper pails. We've found that most of our customers with multiples enjoy the convenience of two diaper pails.