$17 $40
Amazon with MP4NATION has the Brainwavz AP001 Portable Headphone Amplifier for $27 - $10 off with coupon code 9EDKUG6N at checkout = $17 with free shipping on orders $35+. Goes for $26+ around the web.

Has a built-in 120mAh rechargeable battery and provides up to 12 hours of continuous usage.

$17 retail: $40
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Comments & Reviews (3)

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mrbroadcast
Ben's cred: 23
Posted 08/14/2015 at 04:04 PM PT
Posted 08/14/2015 at 04:04 PM PT
What do people think about this?
dennis007
Ben's cred: 544
Posted 08/15/2015 at 08:27 AM PT
Posted 08/15/2015 at 08:27 AM PT
Brain wash...so it have mind of it own
dave_c
Ben's cred: 5862
Posted 08/15/2015 at 11:21 AM PT
Posted 08/15/2015 at 11:21 AM PT
It has some drawbacks, like most cheap amps do, but is generally liked at its price point. Head-Fi reviews:
http://www.head-fi.org/products/brainwavz-ap001-portable-headphone-amplifier

There are a ton of affordably priced alternatives today, even boutique tube headamps can be found under $100 now but they're not so portable:
http://www.amazon.com/Bravo-Audio-V2-Multi-Hybrid-Headphone/dp/B00ADR2DTG

FiiO E6 was generally considered better but that is comparing both at the same price while it's now $28:
http://www.amazon.com/FiiO-E6-Portable-Headphone-Amplifier/dp/B005HJWWW8