Getting legit likes to a Fan Page

Hi guys,

I have a client that needs to increase their like count (to 100k, currently at 25k) and I started doing some camps directed at a fangate tab (using woobox) where users like to download a free e-book.

So far I’m getting around 0.50$. Demo is english speaking countries, cash-back and online savings interest, females, around 22M.

Now, I’m not sure if 0.50$ is good, bad or whatever. Never done legit like camps, mostly tities 🙂

How can I get much cheaper likes? I mean, at 0.50$ I’m neve ...