Test out FREE iOS apps and get rewarded with iTunes Gift Cards & more
Discover great free iPhone apps and get rewarded with iTunes gift cards and more! Click here
This way, you can download commercial apps for FREE, using the gift cards you receive. But you would need a US iTunes account to be eligible for that.
I have tried this out and have received $20 worth of iTunes gift cards upto now, and still getting more points here as well.
This is a truly legal way to get paid apps for free on iTunes app store. Just click the link and register from you iPhones and iPads.