Free: Contests & Raffles.
Google Elknuts. I think his website is elknuts.com. Very good set of DVDs and tons of info about it. I highly recommend the 3 pack of dvds.
This is what you want.http://www.buglingbull.com/Rocky covers it all.
I will testify to Elknut's DVD collection as being exceptional. I have been calling elk for 20+ years, and I still learned things from him that I put to use this past month. The only way to learn what an elk is saying with each of his calls and how you should respond is by putting in 30+ years of being in the woods or having someone teach you. Elknut's videos are that teacher. He stands in front of the camera making the sounds and explaining them: what they mean, why you hear them, how to respond, how not to respond, etc. If you do nothing but blindly follow his advice, then you will be three times the caller that most bowhunters out there today are. If you use his techniques in conjunction with good woodsmanship and adapt to each situation, then your odds will go through the roof.