Its 782$ for the original Shuoer EJ07 and 550$ for rebranded Y***** ST7 version.As far as i am concerned, there is no other IEM that can compete with the Tapes as far as detail and speed goes, in this price range.
The only others that come to mind is the Sonion EST hybrids, but i think the cheapest are 700$. From the OEM rebrand that 'must not be named' .
I would have tried the EJ07 if i knew that guarantee and return wasn't an issue, but It looks like you're on your own after buying those and I can't afford to risk it...
With built-in miniature electo transformer, there is much more stuff that could break, compared to "regular" drivers...
BTW.
Sonion's electrostat tweeters that Shuoer uses were around since mid 2018, but strangely I didn't hear much about any other electrostatic IEMs besides Shuoer's stuff.
https://www.sonion.com/electrostatic-tweeter/
https://www.sonion.com/wp-content/uploads/ds-EST65SA01_v1.pdf
https://www.sonion.com/wp-content/uploads/ds-EST65DA01_v2.pdf
Apparently ca. 152$ for a pair:
https://www.ebay.com/itm/2pcs-Sonio...5DA01-Dual-Electrostatic-Tweeter/362756127245
Hopefully in 2020 we will see more reasonably priced IEMs with electostat tech.