Tried finding them online second hand for a good price but couldn't find it, so I had to buy them new here by Thomann.
My theory is that because its such a good reliable mic, not often someone will really feel the need to sell them.
As I do sound for my bands and other bands, I enjoy the many ways of using this mic.
For congas, toms, other World/Latin percussion...
My main reason for getting these mics was to mic up a Brasilian drum called Zabumba. (A held drum where one skin serves as a Snare, and the other side serves as a kick drum).
I avoided clip mics for some time but with the Zabumba it became inevitable. using two E 904 or 2 E 409 is basically the only way PROs do it in Brasil. great sound, less stands, less complications, percussionist can dance around the stage and have a stable mic system. =)
I am very happy with my purchase.
Cheers!