After listening to that Benji B documentary on Dilla (find it here, really good listen http://www.bbc.co.uk/programmes/b016g2c2) I really want to hear some of his beat tapes.

I realise there's a whole lot of ethical stuff concerning the continuing mess about his estate but are any of them even remotely available to purchase? Or can someone recommend me some good ones to search for and download? I've bought everything he actually released officially, but feel like I need more Dilla in my life.