Which service is best for a literature review paper due in 2 weeks with a budget of $100?

I'm a first-year English major and I've never written a paper on my own before. For my literary theory class, we have to write a 5-page literature review on the theme of identity in 19th-century American literature. I've searched online and found several services like GradeGuru, EssayHub, and Literature Review Helper, but I'm not sure which one to choose. I want a service that can help me find credible sources and organize them in a logical way, and I need help deciding because I'm really overwhelmed with the assignment.