If you need a replacement processor for your Dragon or CoCo, try the following links. All of them are a suitable replacement for the Dragon's Motorola MC6809EP.
MC6809EP (1.0MHz)
http://www.ebay.co.uk/itm/MC6809EP-/260 ... 1296428043
MC68B09EP (2.0MHz)
http://www.ebay.co.uk/itm/MC68B09EP-8-B ... 6172430835
HD68B09EP (2.0MHz)
http://www.ebay.co.uk/itm/HD68B09EP-Man ... 1c24848751
HD63C09EP (3.5MHz)
http://www.littlediode.com/components/HD63C09EP.html