Free book editing/beta reading discussion

I am looking for a editor for a sci-fi Novel. It is 100k plus words as of right now. I am not above cutting some stuff out if need be and there is no rush to get this done, considering I have been working on this for almost 3 years.The problem is I am in no position to offer any form of payment at this time. Money is tight at the moment, but I feel I need to get this novel out. I would be willing to offer a testimonial either in Goodreads or the book itself maybe even both if someone is interested.