Earlier I used to take the help of Course Hero and Chegg, but then I switched to EduYoda when I found several answers for my course. The switch was easy because getting plagiarism-free answer was easier here. I only had to post the question and a tutor was assigned based on expertise. There was no bidding fight which often led to decrease in the quality. Their prices were already less than that of Chegg, which I believe is the most expensive one I ever came across.
Tip: Always opt for the private option while posting a question. As per their privacy policy, they won't post the custom answer written for you over the platform. Course Hero does it and I was caught twice when my friend purchased the same solution. We both were found in violation of academic integrity, but were given another chance.