During my career, I worked with offshore freelance technical writers and content editors from India, Jordan, UAE and the Philippines. Quality was highly variable, and unsurprisingly, you get what you pay for. My best results were from firms, not individuals, in India. All these engagements were for professional documentation or non-fiction content, not for fiction prose.
There are different types of editors, of course. If all you're looking for is technical editing (spelling, grammar, usage, sentence structure, etc.) then you might find a helpful resource at low cost. Of course, you might find a volunteer editor, here.
If it was me, I would take a pass on freelance sites. I might try to hook up with a sharp local journalism student, either through Fiverr, Craigslist or the opportunities office at a local university. One would likely get more attention at low cost, and at the same time, help a student build their resume.