E13ctron has finally opened up pre-orders for its S4V, the Verizon iPhone 4 compatible CNC machined aluminum bumper case. The S4V is now available to pre-order for $84.99 in a matte or glossy finish. As with the S4 aluminum bumper case for the iPhone 4, you have the option to choose your own colors for the S4V for a two-tone look or simply a solid color. Separate bottom and top pieces are available to purchase as well. So what are you waiting for? Head on over to E13ctron and customize your very own S4V. Or you could just check out our review of the S4 case. It's your choice really. The S4V starts shipping on April 18.