If an editor (or cover designer, illustrator, book formatter, etc.) seems out of your price range, don’t give up!
Ask if they have another service that you could benefit from, or if they provide a “light” version of the service you’re interested in.
While we can’t underpay ourselves, many of us offer a variety of service tiers or will work with writers on a custom package to meet their needs.
It never hurts to ask!