The article reports a 0.7% increase in the weekly price of 3.06 PLN/kg for regular milk, a slight 0.1% decrease in the weekly price of 2.99 PLN/kg for UHT milk, a 0.8% decrease in the weekly price of 6.46 PLN/kg for natural yogurt, a 5.0% increase in the weekly price of 4.06 PLN/kg for kefir, a 3.7% decrease in the weekly price of 11.71 PLN/kg for sour cream and cream, a minimal 0.2% decrease in the weekly price of 36.12 PLN/kg for butter, and a 3.7% decrease in the weekly price of 3.81 PLN/kg for whey powder.