The Massdrop x Grace SDAC Balanced is an inexpensive, small-form factor, balanced-output, DAC, based on the very well regarded original Grace SDAC.
From the Drop.com Website:
Following the success of the Massdrop x Grace Design Standard DAC, we’re excited to release the much-requested balanced version. It’s the least-expensive small standalone balanced DAC on the market, designed to complement high-end balanced amplifiers like the Massdrop x THX AAA™ 789, the Massdrop x Alex Cavalli Liquid Carbon X, and more. Grace Design is known for its incredibly accurate, transparent gear, and this new DAC doesn’t disappoint. Based on the single-ended SDAC, it has the same objectivist-minded performance, USB bus-powered design, and simple plug-and-play operation. Plus, it boasts a number of advanced features and supports sample rates up to 384 kHz and DSD256 in USB 2.0 mode.
This is the spot to discuss what is, as far as I am aware, the least expensive balanced DAC available.