Target has big packs of diapers and training pants on promotion: buy three and receive a $20.00 Target gift card. I found Up & Up training pants and underpants included in this promotion with prices starting at only $15.49! There are no coupons for these products, but pay just $8.82 per pack after the gift card! See the details below:

Buy 3, Receive $20.00 Target Gift Card through 9/12

Pay $46.47, Receive $20.00 Target Gift Card

Final Price: $8.82 each, when you buy 3

Buy 3, Receive $20.00 Target Gift Card through 9/12

Pay $52.47, Receive $20.00 Target Gift Card

Final Price: $10.82 each, when you buy 3