Obtaining Police Clearence from FBI

[anthcott@yahoo.com]

I am planning to send fingerprint cards for both my spouse and me with cahiers check for $36 ($18x2) in one package. Would this be OK?

While mailing the fingerprint cards to FBI after taking fingerprints on them should I also include self-addressed envelope? In the FBI form under the "return mail option" one of the option is "Prepaid Return Envelope Enclosed" option  and the other is "First Class Mail". If I choose First class mail will FBI send at their expense?