I'm a bit surprised—with LEED being more and more common it seems that manufacturers are tripping over themselves to provide this kind of information.Can you play different suppliers off one another? Offer to help find the info? Convince them that with LEED being so popular, they should help you, since you won't be the first that wants this information?Of course, you could also decide that it's just not worth it, and try to earn the credit by focusing on other materials.