Take a look through this thread -
https://www.pentaxforums.com/forums/professional-photography-business/92774-a...raw-files.html
The problem may be in finding a photographer to hand over the unprocessed files. As far as they are concerned their work is not complete until they have done the PP.
If you have a university nearby that has photography programs, that might be the best place to search. Most uni's have a website where jobs can be posted. A student might need the money more than the artistic rights to the shots.
If that's really what you're looking for, you probably need to find the photographer first and agree terms second.
It's quite a few months away, another alternative would be to teach a friend how to use your camera. Try and teach more than one, then you have backup. That, obviously would be your cheapest option as, I'm sure, a few beers would be accepted as payment.