My first suggestion would be to proof the part, then have a 3d model made or make it yourself if you have 3d cad experience. I understand your desire to get a target price before doing the needed work as I have been in the same boat many times, and is the reason I feel qualified to give you some direction.
There are small mold companies out there that will work with you but not in hundreds of parts at a time. They can run several hundred parts in a few hours and it is simply not worth their time for the set up. I hate that phrase, but after having experience with it myself, I do understand it better.
Have you proofed the idea?
Can you provide the 3d model?
Answer those two questions before you go on and it will make the process a little easier.