Syba SD-DAC63093 Portable Dual Output amp for $30

The Syba SD-DAC63093 portable dual output (two 3.5mm outputs) is currently on sale for $30 with a limit of five per customer at Aamzon by Amazon actual.

Note that physically this looks like the M-Audio Bass Traveler Portable amp which has a regular price of $29. I do not know if they have the same insides.