What Are The Best Ways To Advertise Online, Besides The Normal Search Engines, Google, Yahoo, Etc.?

I am starting a new business and want to know your opinion on what works. I see a lot of different companies offering the best service and I want to know which are the best.
Also, do things like email marketing, newspapers, banners, etc work?
My business will be an online investment company. Thanks!!

How Can A Small Business Go Back To Normal Prices After Using Big Discounts To Get New Clients?

Offered unseen prices to call attention and worked. We give the best service and have the biggest inventory in town. Want to go back to normal prices without having this move backfire on my sales.