Effective Opt-in
How to build your own email list without buying? Many people forget that their web site is a good source of subscribers and potential customers. Don't lose your potential customers.
Newsletter subscription box / web site sign up form
It's a common technique to build your email list by using newsletter subscription box e.g.

What about placing newsletter subscription box to the middle and just below the product information?

6 times more subscribers than placing it on the right of the page.
Thus, it's important for placement of your website sign up form. About.com places newsletter subscription in the right place too:

How to acquire more subscribers? What if you ask for subscription before downloading or getting full product catalogue?

For single opt-in, it generated 50+ subscribers per day and 10+ per day for double opt-in. (For privacy, date of the data is not disclosed.)
Reasonable Spread - http://ReasonableSpread.com
Email: spread@reasonables.com |