Here is a link to the NRHA approved reining trainers. There are quite a few in Colorado. http://www.nrha.com/trainers/trainerslist.asp
Good ones that have won a lot are going to be $1000.00 to $1500.00 a month. They will not accept horses that are not bred to be champion reiners and their apprentices will actually be riding the new horses until they reach the stage where they are ready to be finished. GOOD trainers are actually spending a great big part of their time showing at the National and International level.