I discover something!
Since we're both filipino I hope you can relate to what am saying Darlanmickey, what internet connection are you using? If you happen to know the internet prepaid card called "KONEK" then good! that card isw made of coroplast! so now I hope you have an idea what coroplast is, after you have the texture ask to some signboard maker, you say you have already ask one, but one is'nt enough. many are actually using coroplast! and that would be very easy to find beacause here in the Philippines there are so many signs you can see on the streets that have the "SIGN" preffix they are the one to make sign boards for mini groceries and other small business establishment, if possible try to find a sign maker that has a word "coroplast" on their sign board and you can actually get them WHOLESALE!.