I went to a huggies wearhouse and bought three boxes of 100 newborn. If I don't open a box I can take it back and exchange for the next size up, so I won't waste any. We were then given a box of 108 newborns, and another pack of 20 (my sisters, she'd used half). So we have HEAPS!! However, DD stayed in newborn for ages, so Im thinking I'll prob get through them. If i don't though, i can return. Worth checking out if there's a store near you where you can bulk buy and return if you want.
At least I shouldn't need to buy nappies for at least 4 months!!! xoxo
PS I don't think you can ever have too many anyway. A good idea if you have too many, is to give some as presents to expectant mums xoxo