I LOVE COSTCO. I'm a big believer in buying bulk (I'll write about that later). I recommend getting on their email list so you can see what's on sale. A goodie this month?
Huggies wipes are $5 off an enormous box, making them just $29.
And remember, their Kirkland brand wipes are amazing too, and are always a good, low price ($26.99).
Happy savings to you :)