Absolute Truth About Sunnah and Bid'a by Abdullah bin Hamid Ali
From the blurb: "Ustadh Abdullah bin Hamid does an excellent job in this CD in explaining the true meaning of Bid'ah and in explicating the technical differences of Muslim scholars about the meaning of this word, like the variance between the definition of Imam Abu Ishaq Al-Shatibi (d. 790 AH) and the overwhelming majority of scholars. You must have this one!" $5.00
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I have not heard it yet, but I am sure it is wonderful. Ustadh 'Abdullah is an excellent teacher and does a remarkable job explaning difficult and controversal concepts. He is based in Philly, and I am not sure about their policy regarding international shipping. And just so you know, he is not a Sufi. A brief intellectual biography of his is available on his website.