Offering a HotUSB1 - a very simple, portable and lightweight USB DAC/Amp unit. I know that it was previously fairly well regarded on the forums here. A very simple and small unit (note the quarter for size comparison) and is powered only via a USB cable (which will of course come with the unit). It was a great friend to me while traveling (absolutely stomping my laptop soundcard) and is, of course fully functional. Extremely easy to use - simply plugin to computer and plug your headphones into the unit.
Price of $40 includes shipping via Priority Mail (2-3 day delivery time). Paypal payment is preferred.
Also offering a pair of UE Triple.Fi 10s in excellent condition here: http://www.head-fi.org/t/615780/ultimate-ears-triple-fi-10-excellent-condition. Purchase both and of course you receive a discount!
Headfi (archive): http://www.head-fi.org/t/416738/the-dong146