It depends on what you are trying to market. There is always word-of-mouth/viral marketing, social media marketing, and article marketing, to name a few.
exactly... do something extremely stupid and cheap like swallowing your own spit and posting it on youtube.. instant fame and huge marketing exposure of whatever you want sell...
Write articles for buzzle.com, hubpages.com, squidoo.com and promote your product/affiliate link. You do free marketing as well as you could earn some money out of your articles. Article marketing is the free & best method of Internet Marketing that drives traffic to you for the life time. Only thing, you have to spend time in writing good quality articles closely related to your product/business !