Sure you can! For the right price I would buy it. I bought a 20 gallon aluminum pot that looked about like that, I scrubbed and finally wet sanded it with some wet / dry paper that I had on hand, and cleaned it up pretty nice. But if you have to start spending money on the rehab you might want to think twice. Aluminum is soft metal and refinishes easily.
The right price is the tough question, and one that depends on your finances, DIY skills, and available time, when considering new aluminum is $60, and new stainless with a lid is $95.