The cost is too good to be true. It is only human to try to find the best service at an affordable price. However it is also true that you get what you pay for. If a service says that it can write your resume for a few dollars it is better to be cautious. Creating good quality resumes requires using specific skills. The cost can be lower only if the summary of your career is part of a mass produced set of similar documents.
The resume for an entry level candidate is often low cost compared to the resume for a professional or an executive. The creation of a good summary takes time; therefore the service you choose may take up to 2-3 days to provide you with the document. Make sure you check whether there are extra charges for any revisions you require. Competent services do not charge anything extra for corrections or alterations.
Focus on achievements Employers not only want to know what you have done in the past they also want to know where you have excelled. If you have awards achievements or on the job highlights make sure to add them. If you were part of a team you were part of the success. If your project increased production by 20% and you played a part in it add it on your resume!