Schema question...

Hey all, first off I would like to say I really appreciate this subreddit for all the help and advice it has provided me learning my way through SEO, it is a massive help!

Now to the question, I am marking up our website with schema, we offer a variety of services all of which have bespoke prices which are discussed on a case by case basis. When trying to mark this up, if I wanted a rich result (which I would) I would have to provide a price according to Google.

Now one thing we do offer is a free no obligation quote, whilst this is definitely not the service we are offering, in this instance do I just have to bite the bullet and accept I don't qualify for any rich results or should I set the price to zero to see if I can still get away with the whole free quote thing.

I don't want to provide any misleading results but obviously grabbing a rich results would be really nice.

Thanks in advance!