It's hard to say what budget of campaign should. It depends on many factors : duration of campaign, number of spots, payment per post rate, number of posts allowed. Also you need to hire someone to create signature design. You also would need for campaign mannager. So, if you want to effective advertise your business with signature campaign, you need to have big budget.
Wow! Now i just seen your comment! It hurts! It really hurts, how someone like you can comment about "..price for buying signature"!
What your comment have with topic?! Have nothing! .. and the worst is that someone will pay you for this "long comment" ..
just reported!