It sounds like it would be good as a compare and contrast essay. In a compare and contrast essay, the introduction paragraph will grab the readers attention with an interesting first line, interesting first sentence, and it should introduce the two things being compared. Let the last sentence of your intro paragraph be an assertion about those two things. In paragraph two, explain the pros and cons of buying new. In paragraph three, do the same for buying used. In paragraph four, say something thoughtful about the relationship between the two. In the conclusion paragraph, reflect on the thesis statement and review your main points.
I hope you do well!! :)
Kevin, EssayForum.com