You need to find out what the name of the material is. When you get that, then locating a distributor should not be too painful. Keep in mind that the name of the material you get may be a brand name. If you can determine the generic material name, then you may be able to find other manufacturers. (depends on patents, etc.).
If you are certain that 3M makes the material in this image, then I would suggest visiting their website. Find a contact address and send the image to them. If 3M is the only maker of the material, or you just want to buy that brand, then 3M should be able to point you to a distributor in your area. I know that they have such links from their electronic components.