I remember buying Chad Hamzeh’s course on media buying. It is hats off one of the most in-depth video course when it comes to banner advertising and it also covers some basics on affiliate marketing and also recommendations from the author as to what affiliate networks to join. It would have been great if you could have listed the marketing channel you are interested in learning. I would say most of the information is available online, so no need to buy any such course. Go watch some Youtube tutorials online and I am sure you will do fine.
In April 2008 the State of New York inserted an item in the state budget asserting sales tax jurisdiction over Amazon.com sales to residents of New York, based on the existence of affiliate links from New York–based websites to Amazon. The state asserts that even one such affiliate constitutes Amazon having a business presence in the state, and is sufficient to allow New York to tax all Amazon sales to state residents. Amazon challenged the amendment and lost at the trial level in January 2009. The case is currently making its way through the New York appeals courts.