It won't be the best sandwich you've ever eaten, but you can't beat the price. Both Asian and European sandwiches are dependable, filling, and really cheap. I'd expect most other sandwich places to charge double for something similar. For the Asian, I like the grilled chicken or the lee's special if I'm not feeling squeamish about cholesterol heavy mystery meats. I'm a sucker for croissants, so I also really like the roast beef, turkey, and provolone on croissant.
Whole baguettes are only a dollar and so fresh that you'll almost always get a hot one. If you're not in the mood for sandwiches, they also have Vietnamese spring rolls which are a bit heavy on the lettuce, but inoffensive.