Even though this is a short list of products, I didn't find such a summary here or anywhere for that matter. Hope this helps someone.
- THX Onyx ($150 amazon, $233 walmart under the brand Lixada) (review)
- FiiO Q3 ($150 amazon) (no ASR review)
- FiiO AM3D ($190 aliexpress, sold out elsewhere, requires compatible FiiO DAC: X7/X7MKII/Q5/Q5s) (Q5s+AM3D review)
- Monolith 24460/124460 ($300) (review -- which annoyingly does not contain the proper product name in the title)