I agree with Jackolatern. In addition, the amount of fees is same as that you would have paid had you filed AP before Aug 17. Here is an excerpt from USCIS website about the fee -
USCIS reminds the public that all filings submitted on or after July 30, 2007 via the electronic filing system must be submitted with payment of the new fees.
Filings made Pursuant to Visa Bulletin No. 107: As previously announced, all forms I-765 and I-131 applications based on employment-based adjustment of status applications filed pursuant to Visa Bulletin No. 107 that are submitted on or before August 17, 2007 must be filed under the fee structure in place prior to July 30, 2007. On or after July 30, 2007, those applications may not be electronically filed and must be submitted to a Service Center via regular mail or courier service.