Facebook advertising
 

I have to say, recently I started promoting our facebook posts through the "post promote" feature on facebook and we have gotten a ton of likes and new business from it. I'd recommend checking this out. Our page went from about 120 likes to over 260 in less than a week. It lets you chose a budget of starting out like $10 and then you can continue to increase it.

Good luck let me know if you try this and how it works out for you.