HTC is launching another color variant of its One handset. A new "Metallic Blue" color will be made available exclusively at Best Buy on AT&T, Sprint, and Verizon. HTC is planning to launch the variant later this month, just days after unveiling "Vivid Blue" One and One mini variants for Europe. The new color might look similar, but HTC says it's a "slightly deeper shade" than the European version. HTC's latest color variant joins the existing black, silver, and "Ruby" or "Glamour" red options. Best Buy isn't providing pricing for the Metallic Blue variant just yet, but it'll be available on September 15th.