I just found this one, price around 330 british pound, and it does native DSD over DoP.
Anyone tried it yet?
http://www.denon.co.uk/uk/product/pages/product-detail.aspx?catid=hificomponents&subid=usbdaconverters&productid=da300usbKey features:
High definition DAC with 1 x USB-B, 1 x coaxial and 2 x optical digital inputs
High quality audio components for rich, open, detailed sound
Denon Advanced AL32 Processing and High-Precision 32 bit, 192 kHz digital to analogue conversion for exceptional high definition audio quality
DAC master clock design for distortion free, fully transparent sound stage
Noise isolating circuit design prevents distortion via USB connection from computer generated digital noise; ensures fully transparent and spatially accurate sound stage
Universal bit-transparent, asynchronous playback of digital audio file formats and streaming audio from PCs via USB-B; up to 24 bit, 192 kHz and DSD2.8 and DSD5.6 native support by DoP (DSD Audio over PCM frames)
3x SPDIF (coaxial/optical) inputs for upgrading sound from other digital audio devices (up to 24 bit, 192 kHz) with the DA-300USB’s advanced high definition signal processing
High quality analogue signal (line level) output and headphone amplifier stage, for connection to hi-fi amplifier or desktop speaker system and superb listening with all kinds of headphones or in ears
Simple plug-and-play operation for connection to PCs (dedicated driver available under "Downloads & Manuals") and other devices with digital audio outputs
seems interesting.