We covered this a year or so back when a casino was wanting doc's notarized from another player, you can usually just go to any bank that you have an account with and have this done for a small fee.
Im a Notary, all they will do is look at you and your ID and log it into a book, they will then seal and sign off and date it that you appered before them, they may want to have you sign a form the casino might send in front of them to verify signature.
It shouldnt cost you more than a few dollars.
I really see no need in this personaly.
From Wiki:
A notary public (or notary or public notary) is a public officer constituted by law to serve the public in non-contentious matters usually concerned with estates, deeds, powers-of-attorney, and foreign and international business. A notary's main functions are to administer oaths and affirmations, take affidavits and statutory declarations, witness and authenticate the execution of certain classes of documents, take acknowledgments of deeds and other conveyances, protest notes and bills of exchange, provide notice of foreign drafts, prepare marine protests in cases of damage, provide exemplifications and notarial copies, and perform certain other official acts depending on the jurisdiction.[1] Any such act is known as a notarization. The term notary public only refers to common-law notaries and should not be confused with civil-law notaries.
Laurie