rhs.hk worked for me, but expect the tracking number you get from them to not work for weeks.
(I imagine rhs.com is faster, but they actually charge for shipping...)
Figured it out. I got lucky.
On http://www.ezflash.cn/downloads/ there's this file: http://www.ezflash.cn/zip/EZ4_2014.rar
(Note that it's .rar, not .zip; the .zip file contains different stuff for some reason)
The file should contain 3 files: an EZ4_Client.exe from 2006 and two .bin files...