Diaper Stockpile List! How many should you stockpile? This are just to start out and remember every baby is different. Always keep your receipts in an envelope somewhere just in case you need to exchange them. Places like Walmart, Costco, Babies R Us, and Target will exchange them without a receipt. If you have open packs try selling them on craigslist, ebay or facebook. Plenty of people are looking for a good deal. However, you'll probably be selling them for around .10 per diaper.