Ondesoft offers downloads of Ondesoft Audiobook Converter for Mac for $29.95. Coupon code "dealmac" cuts it to $14.97. That's $15 off, tied with our mention from three weeks ago, and the lowest price we've seen. It purports to allow you to convert DRM-protected m4b, aax files into any of the most popular file formats on your Mac including MP3, AAC, AC3, AIFF, AU, FLAC, M4A, M4R, and MKA. It's compatible with OS X 10.6 and above.