USPS Priority is that price. Express is $75 and I'm not sure if tracking is available to China - I will check on that on Monday, but there is no indication that it is an option on the USPS website). International Priority Mail to Asia is NOT trackable last time I checked (that years ago so correct me if I'm wrong) - again, on their website no option for tracking is mentioned. Yes, otherwise it is cheap, and thank you for the suggestion. I am not willing to risk sending a $800 device back to China without any means of tracking it. iBasso requested that I claim it as a USB sound card valued at $50 which negates proper insurance (which would be very expensive anyway). Call me crazy, but I won't ship it without a tracking number and a means of knowing its been delivered on the other side of the globe.
On that particular note, one other thing worthy of mentioning. Someone in this or one of the the other DX100 threads asked about whether a signature was required on delivery. I suggested because of the value of the contents that it would have to be. Well, I was shocked to find that UPS had just left my DX100 sitting out on our front steps. This isn't Kansas. We've had packages taken from our steps and all around our neighborhood. I've previously put a lock on our UPS so they theoretically should not have left anything, and I'd even left a note that very day that they should deliver all packages to our neighbor who was home all day. Yet they left it on the stairs anyway. This may be, though I cannot say for sure, that iBasso does claim the contents is a $50 sound card and that is clearly visible on the customs form on the package. I can see where the UPS guy might just look at that and weigh his leaving it out on the front steps vs. losing time doing something else. Anyway, iBasso should make sure their deliveries are all "signature required" for the DX100 given the value of it and the cost of replacing it.
I ship many, many, many packages. I know what things cost. Express is only $75 if you buy the flat rate box which is a new creation and is quite big. I know that Express, which is trackable and insurable, is $41, because that's what I paid to send my DX100 batch 1 back to iBasso for upgrading to the new case, caps and firmware. I bubble wrapped the retail packaging and stuck it in one of their Tyvek Express envelopes. International Priority is in the mid 20s now, probably about $30 for something of that weight. Rates went up recently so an Express flat rate envelope is $38, minimum price $35 for 4 ounces and under for other express parcels. Something that's between 1 and 2 pounds like the Dx100 in its retail packaging is $41.
iBasso should require signature for the packages, not sure why they don't. I'm sure if you asked they could make that happen.
You may be able to insure it for a set value but declare it as a return so they don't get taxed. Insurance up to $1000 is usually $2.25 on an Express parcel.