Don't know anything about the pay for installers in Tulsa.
Service is typically secured through 3rd parties, i.e., SBC, Valor Telecom, American Satellite. 2 guys that handled my install (they had to send someone out twice) both wore shirts with Dish logo, however, and in talking to them, they only did work for Dish although I suspect it was on a contract basis.
So, bottom line, you might want to call E* directly on this, or one the third party companies I mentioned to see if they can point you in the right direction.
Good luck.