Constant Contact Email Marketing is affordable for any small business budget — prices start as low as $15/month! You can send as many permission-based email newsletters as you want. It's still the same low price. There's nothing to print, no stamps to buy, no envelopes to stuff, and no paper cuts.

this is the links of this site: http://www.constantcontact.com/email-marketing/what-is-email-marketing/index.jsp

if you could see their charges as above sample is quite diffrent from your services on email mktg. could u help understand