Question about HP 950xl/951xl

@Digitec The current HP 950XL/951XL BK, C, Y, M bundle costs 270 CHF. Purchased individually, the same costs just under 160 CHF!!! and with the current promotion of the 951XL M, C, Y bundle, it is still around 130 CHF. Small differences, especially in combination with promotions, can happen, but 110 - 140 CHF more expensive or a price difference of around 70% - 110% is not justifiable, is it?