ModMic 4.0 is available again on Massdrop and its cheaper than retail but you'll have to wait longer for it.
Good as mic upgrade if only thing you want is new mic on your headphones.
Here is the normal link https://www.massdrop.com/buy/antlion-modmic-4
If you want to register and buy it[or something else on massdrop] and dont mind helping me out here is my ref link http://dro.ps/b/pgwhR5z
Point of the site is that its bought in bulk, and customer [is supposed to] receive better price.
Estimated ship date is Sep 15, 2016.