So how much are diapers at costco? | AnandTech Forums ...
Feb 11, 2011·They carry size 1. Its in a box marked 1/2. The first month we bought newborn size then 1 box of the 1/2 and by the time the 2 1/2 box ran out he was on number 3. Kids will grow out of the 1-2 size real fast. OP they cost $40 for a box, thats in N.VA. The lowwer the number the more diapers. Go to costco.com and you can see how many per box.