EveryStudent.com Vertical Banner
8 ft high, comes with a stand and a carrying case.
It's a pop-up banner, retractable. Lightweight.
Full color. Only $115 (which includes shipping!).
Here's what it looks like when up (see photo below).
Here's the banner. "Save as" on your computer. (File size: 36 MB)
Here's where you upload the file and order the vertical banner: