http://www.amazon.com/gp/aw/d/B00O4Q69FQ/ref=mp_s_a_1_1?qid=1438191437&sr=8-1&pi=AC_SX200_QL40&keywords=naze32&dpPl=1&dpID=41OdiENziwL&ref=plSrch
The Mullet Flight Controller is a Naze32 clone, and not too overpriced via Amazon:
Just bought one a few weeks ago.