anchor chain size

I have a 2004 Hunter Passage 456 with a Simpson Lawrence Horizon 1500 windlass. I am in need of a 3/8 G-4 Chain Gypsy. Any ideas where I can locate one?

Hi all I recently bought a 2007 Hunter 45CC. It has a Lewmar (Simpson-Lawrence) Sprint Atlantic Modified 1000 vertical windlass (no drum). The previous owner only has 50' of 5/16" BBB chain and I want to get 150'. Looking at the paperwork that came with the boat it would kind of indicate that...