Hi rossn2,
It would generally depend on the blend of each type of latex or on whether the Dunlop had an organic certification and on each different manufacturer’s supplier, pricing policies, shipping costs, or any of the other factors that can affect any individual business’ prices for different products but you can see a “ballpark” comparison of the different types of latex in post #6 here although these may not hold true in every case or for every business.
Phoenix