for almost free you say !?
well you could buy the get google ads free ebook, basically it could tell you how to do it in a single paragraph but it's a highly padded ebook explaining how to recoup the costs of your google adwords bill by selling advertising space on your landing/thankyou/confirmation pages.. this way you offsett some of the cost of you google ads and get them "free"
some people are getting almost free ads by doing a prepaid credit card scam but they risk prosecution for sure when google catches up with them (I'd guess it's when the shares hit about $400 a pop,
am sure they'll start tightening the belt then)
failing that do it the right way by giving google what it wants :
bid on highly relevant phrase and exact matched keywords, add a sprinkle of highly irrelevant negative terms, write highly relevant adcopy pushing the benefits of your site/product/service, send it to highly relevant landing page with the keywords you are bidding on sprinkled in there on a site/subsite that's releveant to your terms, then monitor conversion, adjust bids, try different ad positions etc.
no doubt you'll be adding a link to your sig shortly detailing how we can get google ads almost free and be in the top 10 !?