whats the best way to advertise a small coffee shop?

[snoopy311]

I work in a small coffee shop in a mall in Salt Lake City, Utah (for those of you who don't know utah is probably the worst place you could possibly make a coffee shop because our LDS population believes it is a sin to drink things like coffee) my shop is in a mall also in a bad place in the mall so most people don't even know that were here, I get paid 30% commission meaning of everything I make on my shift i get 30% of that, on slow days i can get paid as low as $17ish dollars for a 6 hour shift. I need some help with some ways of advertisement (at little or no cost) to try and at least get the word out that there's even a coffee shop in the mall my wages depend on it haha. Please help if you can all ideas are appreciated.