M4P to MP3 Converter for Mac 
This utility can bypass DRM-protection and is able to convert iTunes DRM M4P, M4B, AAX files to normal audio formats on Mac.
Audio Converter Pro 
It is a professional Mac audio converter which provides a simple and fast method to convert between most known audio files: MP3, MKA, WAV, M4A, AAC, AC3, AIFF, AMR, FLAC, WMA, MP2 etc.
Easy Audio Converter for Mac
Quickly and simply batch converting video and audio to various audio formats on Mac OS X.
Audio MP3 WAV WMA OGG Converter
Audio MP3 WAV WMA Converter is designed for converting the most popular audio formats MP3, WAV, WMA, and OGG from one to another directly and on-the-fly (without temporary files produced).
If you can not order from the above links, the following ordering links, they support the following options,
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Audio MP3 WAV WMA OGG Converter
https://secure.element5.com/shareit/checkout.html?productid=161718&language=English
Audio Converter for Mac
Audio MP3 WAV WMA OGG Converter
Audio Converter Pro