Use Firefox browser with AdBlock or AdBlockPlus.
You can find a proxy server in another country, then every site you visit will think you are from that country and give you appropriate ads.<br />
A simple thing to do is to use google in different countries, like google.com.mx (Mexico) or google.com.au (Australia). The ads that google shows will be for people in those countries.
try http://www.tunnelbear.com/<br />
you also might look at adblockplus
You can do pretty much everything with a computer :)<br />
The question is how much time and effort you are willing to spend on it.<br />
Anonymous is also an option.