Google AdSense blog posted that, they’ve received a few emails from new AdSense applicants about not being accepted into the program despite paying a specific amount of money or buying a CD package.

All new applicants, please read this carefuly: 

We’d like to take this opportunity to state that we're not affiliated with any third-parties that solicit payment to join the AdSense program or that sell CDs with money-back guarantee offers. AdSense is a free product offered to publishers by Google Inc., and there’s no cost or obligation involved. As a result, we recommend that prospective publishers exercise caution when presented with such offers.

To submit an application, simply visit www.google.com/adsense. Please also review our program policies and our application tips before applying.

Google, AdSense, Applicants, Publisher