Buying this virtual product gives you the best prices on single-piece diapers.
Without Santa’s Special, diapers sold by pieces are priced regressively: the price of single diaper is relatively high, and the more (singles of any kind) you buy within your order, the lower it falls down.
This scheme is set up to cover for fixed costs from processing such an order, as described here.
By adding Santa’s Special to your cart, you immediately get lowest possible prices on those singles, no matter their total count.
Moreover, Santa’s Special price drops automatically as your cart reaches 9, 18, or 27 eur.