Hey FlyinLow,
Usually people do not have to pay for a turbine course to get a job. They may, however, have to commit to a training bond though.
You will find that most people who transitioned from Piston to Turbine did so through a company that has both types. I, for example, Worked on a Navajo and then got a Metro rating from the same company after I had been there 6 months-thats a pretty typical progress for many.
There are alot of companies out there that operate both piston and turbine.
Keep at it!!!