Do you want to process the CCs yourself? Maybe cheaper to start with, though you would still need a merchant account with your bank (pretty much like they do in brick and mortar shops), but you would need to tell them that you intend to take internet sales - which will raise the fees a little.
If the above is all you need, then take a look at a freebie like
http://www.mals-e.com
They take the payment, you get notified but you do the CC check yourself. You can also upgrade to a premium account where they do the processing for you.
As I don't completely understand what you are after, this is all I can offer right now
Nadia