Update (1/04 2:20pm): Adorama has the Denon DA-300USB High Resolution Audio DAC Headphone Amplifier for $219.99 shipped (Reg. $455+).
Adorama is offering the Apogee Electronics Groove portable USB DAC and headphone amp for $239.99 shipped. That’s $55 below the going rate from just about all major retailers including Amazon and B&H. While we have seen it discounted as part of larger (and more expensive) recording bundles, this is the lowest direct discount we have ever tracked since Apogee released the Groove DAC. While reviews are some what light here at 4.8/5 stars from only 30 Amazon customers, Apogee is widely considered to be a (if not, the) recording industry leader in analog-to-digital conversion and just about all of its gear has 4+ star ratings.
This mini portable (“Quad Sum”) headphone amp/DAC offers studio quality audio playback on-the-go and is great for driving high-end headphones. It features 24 bit/192kHz audio, USB 2.0 for direct connection with your Mac/PC, and a Made in the USA all-aluminum exterior. You’ll find even more details right here.