Denon DA-10 Portable USB DAC/amp for $150 w/FS

Perusing the top selling DAC/amps at Amazon reveals a sale on the new condition Denon DA-10 Portable USB DAC/amp for $150 by HifiDef Lifestyle with the order fulfilled by Amazon, so Prime members get free 2-day shipping. It is also offered for the same price from the HiDef eBay store (no Prime shipping obviously). Their eBay store says they have five units available.