+1, also used MyFBIReport. Very professional. The USPS had even lost our original certificates sent First Class mail, but we called and they resent it using 2-day priority mail. Only thing is that the address needs to be US address, so since my wife is living with me, we used a shipping service just across the border in Blaine, WA.
To answer a previous poster's question - fingerprint cards are just fine, that's what we used to send in to channeler. If you need a recommendation for fingerprint shop in Vancouver, PM me.