Various books and apparatus for sale on eBay, see link below:
http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5574658498&toolid=10001&campid=5335883257&customid=&mpre=http%3A%2F%2Fwww.ebay.com%2Fsch%2Fm.ruetz%2Fm.html%3Fitem%3D380591404182%26pt%3DLH_DefaultDomain_0%26hash%3Ditem589d03f496%26rt%3Dnc%26_trksid%3Dp2047675.l2562