These items are sold by Vannuys via the Amazon as a portal. I saw price listings for shipping within Japan but no price listings for overseas. So I'm not certain. Maybe you can try a mock order to see if it'll go through.
Mimo manages to order a Vannuys case to be delivered to China. Maybe he could chip in on how he did it.
Meanwhile about the topic of DSD, although I'm a huge DSD/SACD fan since 2000, I must say that it's not a necessity. It's definitely a nice to have & I even talked to some US vendors early last year to consider DSD support in their DAC Amps but it's not a must have. I've read in other forums where members who may not have experienced DSD shun a product cos it doesn't support DSD and I'm kinda disappointed to read that.
Note that DSD doesn't automatically mean better sound. To me, DSD just means it's closer to mastering. If mastering is bad, well you'll hear that bad mastering more easily or clearly. Also not all DSDs are from hires recordings. I've been told (although not substantiated yet) that there are times mastering is done at a lower quality (say 48kHz which is just above CD) to save storage space then later upsampled & converted to DSD format. Sadly I've not found an example of such a SACD yet. So personally I kinda trust old mastering instead - pre-digital days. If it's more modern digital mastering then Sony actually makes hires microphones for DSD mastering which I understand aren't commonly used yet.
IMHO, I actually don't think I'd expect to hear much diff between real-time converted DSD->PCM in the ZX1 vs a pre-converted DSD->hires PCM that's uploaded to the ZX1. This will depend on what the real time conversion is naturally. However, my pre-converted DSD->PCM 192/24 seem to result in bigger files than the original DSD files themselves!! So I welcome DSD support more to save space in my ZX1 instead.
Edit: I just read what Purk said above. I echo his concerns.