Most Internet marketers use WordPress. A few use Blogger. And even fewer go for Typepad. I don’t know about Typepad, but as far as I know you cannot turn a Blogger blog (even on your own domain) into an e-commerce site. You can use WordPress for that with a plugin.
But there are alternatives, which are free. I was asked to write about SEOTOASTER, which is an Open source CMS (Content Management System) script that can be used for e-commerce as well. So if you plan on making an online store, why not give this script a try?
Here are some further information about SEOTOASTER.