How do you get paid iPod Touch apps for free?

sure you can download an app called "apshopper" with that app you will know which paid apps are given for free just for today. each day thousands of paid apps are offered for free for a few hours.

Another way is to register with http://appiration.com and get not only apps for free but earn a little bonus. All for reviewing the apps.

You can also check appbox.tinyviews.com everyday to get paid apps for free without jailbreaking.