thanks for the tip, I'll check that site, in your opinion are there any other iems with a similiar sonical signature?
e-earphone is also supported by buyee, so you can (for a small fee) pay a company called Tenso to buy it for you. If you don't want to go through the hassle of doing it yourself. Just add the Browser Plugin and if you add the product to your cart, the Buyee plugin will add it to your Buyee Cart and then it can takeover the whole process for you.
e-earphone is Japans biggest Earphone store and official/certified Sony Reseller and, as far as i know, the biggest Sony Audio Partner too. You can get replacement parts and other stuff there too.
But it still is importing from a different country. No returns/refunds(!). In case of damage, you have to send it back to Japan at your own expenses and so on.
If you don't speak japanese, you might refrain from shopping in Japan because the staff at e-earphone does not speak English and does not reply to any non-japanese message. That means if you have any issues with the IER-M9, you have to communicate with them in japanese.
I have not heard of people who have issues with their IER-M9 yet and mine works perfectly fine too, but you should be aware about that.
Similar sonical signature in an all BA? That is a tough question.
The IER-M9 sounds unique because it doesn't use air ducts, no sound pipes and an unique cross-over gateway that uses multiple drivers at once with their in-house developed film capacitors and an physical LPF on the woofer.
Something like that doesn't exist a second time and something that gets close to it neither. So its technical aspects are unique, but there are all BA IEM that have an excellent sound and share similar tuning characteristics.
The best example is the FiiO FA9 (which sells for 350€ right now which is insanely cheap) in the "Bass Boost" setting.
It is not the same, don't expect that but to my personal opinion, if you're looking for the IER-M9 sound, the FA9 in the Bass Boost most likely gets the closest to it as it is an good sounding, warm and enjoyable all BA IEM
Only the IER-M9 is the IER-M9 but for 1000€ less and without the hassle of imorting, the FA9 is an excellent all BA IEM with similar tuning (only tuning and only similar) and so pretty much a no brainer.
But if you want the IER-M9 sound, there is nothing else than the IER-M9 itself that can give you that.