500 ks - 4 400 Kč	x1 x2 x3 x4 x5 x10 x20	shopping_cart
1 x 500 ks - 8,80 Kč/ks

1000 ks - 8 500 Kč	x1 x2 x3 x4 x5 x10 x20	shopping_cart
2 x 500 ks - 8,50 Kč/ks