Target is offering $20 gift cards for 2 giant packs of Pamper or Huggies diapers. With the expiring $10 off $40 store pick up offer from target.com, that makes 2 giant packs from about $70 to $40. With Target red cards, there is 5% discount as well. Personally I picked up Huggies little snuggler size 2 (12 to $18 lbs).
This is better deal than a similar deal I got from target recently, in which they offer $10 GC for 2 super packs Pampers new born diaper, which costs $50 before tax.
Sam’s Club: I bought a “super giant” Huggies’ size 1 snug and dry pack from them, which has 192 pieces, and they offered $6 off about $40 original price. From this article at babycenter it appears “little snugglers” is better than “snug and dry”.
Of course, the risk of stocking up diapers is overstock 
From personal experience, size 2 is a safe bet, because infant usually slows weight growth after couple months. That’s why I don’t want to stock a lot new born and size 1.
Last but not least, when placing order at Target.com, make sure entering a valid email address to receive the free Gift Card, it appears their web page does not check that. I had to call their customer service to get the $10 GC as I forgot to put it my own email there.
PS, I picked up the huggies size 2 order this morning at 8 am. Because this is the last day of tax free holiday this year, there is quite a crowd and the Guest Service lady complained about this “flexible fulfillment” promotion (pick up in store), and the tax holiday thing. I waited for about 10 minutes before they got the items from their warehouse. Anyway, it appears Target is getting some disgruntled workers. And a related question, if a store is full of deal seekers, and not many people willing to spend, that also signals trouble, right?