How to discover lowcost keywords ?

[Dmoz]

Keywords are considered the lifeline of any successful pay per click campaign. If you select the wrong ones, you can zip through your entire advertising budget without getting anything in return. If you choose the right ones, you can beat your competition to the punch and get a better ROI by spending less.

Any ideas ?

 

[aixporter]

Use google and see which companies in your industry is performing well. Look at their keywords and pick synonyms of words that they aren't using. These will be your low cost words.