All the prices are for a single box. That
means if you buy several boxes you will pay for "each" box the 2nd, 3rd and
4th price, depending on how many boxes you buy.
If you want to buy 1 or 2 boxes (250 or
500), you will pay the first price for "each" box.
If you want to buy 4 boxes (1000), you will
pay the 2nd price for "each" box, that is 4 X the 2nd price.