If you were interesting in buying the Limited Signed Edition limited to 300 copies, but missed the first oportunity, there is a few copies left to sold now that Top Shelf have delt with the first shipments.
It is here http://www.topshelfcomix.com/catalog/unearthing-signed-and-numbered-hardcover/808 (http://www.topshelfcomix.com/catalog/unearthing-signed-and-numbered-hardcover/808)