A good book that every discus owner should have on hand is the 1992 Discus Annual #1 by TFH (Tropical Fish Hobbyist). There are articles in there from people like Jack Wattley, Wayne NG, and quite a few others that are very knowledgeable on discus. It's a good reference to have on hand. I just got mine a month ago and it is filled with great info, even though it was put out in the early 90's. The discus experts all say that the keeping of discus hasn't changed any in the past 50 years and that the magazine is a great learning tool...they are right!
A great source for discus information would be www.simplydiscus.com/forum
. Experts and enthusiasts from all over the world gather there to share knowledge and to ask questions. You should definitely check it out before you decide to take the plunge into the world of discus. You will quikly gain knowledge just by browsing through old threads. I've got no problem with you asking me questions either. You can send me a PM on here or on that site as well (same username) with any question you may have. If I don't know the answer, I may know someone that does. As far as buying your discus, there is a sponsor of the Simply Discus website that is located in Townsville, Queensland that would be your best bet for healthy fish. He imports from the top Asian breeders and does a little breeding of his own. He should be able to ship to you.