These are not listed in any kind of order. You may check out thier websites as to cost, location, applicability to your particular states' requirements.
N.I.B.E:
www.bounty-hunter.net
Amherst Academy of Bail Enforcement:
www.beagent.com
Pacific Northwest Bail Enforcement Academy:
www.bailacademy.org
National Association of Bail Enforcement Agencies:
www.nabea.org
Compass Point Investigations:
www.compasspointpi.com
Bail Enforcement Civil Process Associates:
www.fugitiveinvestigations.org
Others may add to this list any training institution that is reputable and recognized by the industry as being professional, legal, and legitimate in its teachings.
Any attempt to add USRB will be thwarted, as I will request a moderator to remove it.