Instructions
Take advantage of the free trial card that you received when you purchased your Xbox 360 console. Your Xbox, if purchased brand new, should come with a two-month trial card. Simply get connected to the Internet on your Xbox 360 and then enter the codes on the card to activate your two free months.
Salvage membership cards you receive for free in new game packaging. Many newly purchased games will have between 48 hours and three months of free gold membership access on code cards placed inside the game case with the game booklet.
Buy yearly memberships. Though this will cost you around $50, you may be able to get a free month from the purchased membership package.
Take advantage of free weekends offered by Microsoft, the makers of Xbox, and watch your Xbox Live dashboard for special offers or promotion where you can win free membership codes exchangeable for months or a year of access to Xbox Live.
Sign up for trusted sites like Points2shop.com and Mypoints.com that offer points for opening spam email, taking surveys and purchasing items over the Internet using their site as the middle man. You can later cash your points in for gift cards you can use to purchase Xbox Live gold membership subscription cards.