Stoner Acoustic's second version of their second budget model which was just an updated version of the V1 in that you no longer need any driver's to run on Windows, along with it being plug and play on most operating systems and devices.(tablets, phones, etc). Being a very small footprint of higher quality audio for under 60$ after shipping is some serious competition.
Fournier HTA-2 Hybrid Headphone Amp
Fournier HTA-2 is a hand built tube hybrid headphone amplifier, they were hand built in the U.S.A...
Audio Poutine CDAC+
This is a diy product very similar to the ODAC, and though the internal is mostly similar there...
TOTL Universal In Ear Monitor from Audiofly, 6BA Drivers in each earpiece
Gemini Doctor WS 1.2 Blue Bird Portable Amp
Product Details Model: WS1.2 Product Dimensions: 24mm*81mm*57mm Weight: 0.16kg Output Power:...
Acoustic Research AR-H1
Planar magnetic headphone, lightweight, great build quality, relatively comfortable, balanced sound quality.