The PS4's Eye camera will be priced at $59, as will each additional DualShock 4 controller. That's according to a Sony Japan press release (via Engadget), which notes the Eye camera isn't included with the $399 PS4.
The additional controller is priced slightly higher than the Eye camera outside of the US. The DualShock 4 costs €59 and £54 in Europe and the UK, while the Eye will go for €49/£44. Sony's press release notes both will be available in that ever so "jet black" color.