None of the I-864 forms need notarization.
The I-864A does not have a place like the other I-864 forms for a notary, it uses the same language as the other forms, and does not need to be notarized.
QUOTE
Some editions of the Form I-864 and Form I-864A include a jurat to be completed by a notary or by a consular or immigration officer to show that the person signed or acknowledged the signing of the Form I-864 or I-864A under oath. The Form I-864 and Form I-864A, however, provide that they are signed “under penalty of perjury.” Thus, 28 USC 1746 (which deals with the legal effect of unsworn statements) makes it unnecessary for Form I-864 and Form I-864A to be signed in the presence of or certified by a notary public or an Immigration or Consular Officer. Note that the jurat has been removed from the January 15, 2006 edition of the Forms I-864 and I-864A. Form I-86EZ is a newer form, and therefore never had the jurat.
http://www.uscis.gov/propub/ProPubVAP.jsp?...ad312b1ab639b17QUOTE
Are the Affidavit of Support forms required to be notarized?
No. The sponsor just has to sign the form. You should know however, when the sponsor signs an Affidavit of Support form, he/she certifies that the information provided, transcript and/or photocopy of tax documentation is true and correct, under penalty of perjury.
http://travel.state.gov/pdf/I-864GenInfo-FAQ-Final.pdfSometimes the webpages are overlooked and have wording for the older forms. If the form itself complies with the new format that does not need notarization then no notarization is needed.
ALSO: The consulate CANNOT ask for any of the I-864 for K-Visas, they are required by law to use I-134 for K-Visas, so it is highly improper to request I-864A from the co-sponsor, they should request the co-sponsor to provide an I-134.