Any places that i can gaurantee im not getting an old carbon filter?

Not saying anyone is trying to rip me off (although never know on the internet).. but I'm willing to pay a good amount to get a nice/new filter... very small, 4 inch. Anyone have good experience with a place?

Check out the DIY section lots of carbon filter ideas that can be modified to fit your needs and you know 100% it's new cause you built it!!