AudioQuest Dragonfly Cobalt USB DAC + Headphone Amp – Headphones.com
AudioQuest DragonFly Cobalt Portable USB DAC - The Music Room
AudioQuest Dragonfly USB DAC Bundle with AudioQuest Jitterbug USB Data Power Noise Filter and AudioQuest DragonTail USB 2.0 Extender (for Android Devices) - Cobalt - Newegg.com