When making posters for class presentations, design it on a PowerPoint slide and order a print online but uploading your slide to Office Depot or office max or whatever your preferred site!
Make sure you double check the preview before you submit and do not fit the slide to the page (otherwise some things might get cut off or something accidentally).
It’s only like $12, it can be shipped to you directly and comes with a box to store it in until your presentation, and it takes less time because you don’t have to go out, buy all the materials, and glue everything together.
You’re welcome. 😉