Will we be able to purchase the Blade in game for UEC at some point or obtain it some other way? Or is this sale our only opportunity to get one?

The 'replica' Blades will not be commonly available on the open market; we intend them to be something that's earned rather than outright bought in the finished game. We may offer the ship again through the pledge site when it's flight ready, but it will not be a design that's commonly available at an ordinary ship dealer.