Affiliate Marketing as Extra Income : Affiliate marketing is cheap to set up, being a home business. Apart from setting up the home office itself, there are more costs involved in setting it up and get it running smoothly. Stuff like office tables, chairs and other home office accessories can get a little expensive depending on your choices, tastes and aesthetic sense. The other costs involved will be at your induction into the affiliate marketing industry. To generate that extra income you will need to invest in finding web spa...