Since paying travel and perdiem is extremly expensive I suggest that Dau training for certifications be done on site. Those agencies within the same area can be combined and perhaps the only expense would be for mileage. For example there are numberous agencies in one state and many individuals require certifications for continuing education. Many perfer not having to travel and transportation cost are extremely expensive.
It would require planning but in the end there would be hugh cost savings by eliminating travel.