You probably do not need an affidavit of support since your intended period of extended stay is only 6 months. However, if you can get a US citizen/LPR to execute a Form I-134 for you. it may further convince CIS. Regarding the fees for your B-2 extension,you should go to the uscis web site
Answered on Jun 17th, 2013 at 9:45 AM