If you're lucky to live in a major city, you can probably find a comics store, or a bookstore that stocks them. If not, it can be hard to get access to these be-pictured stories.
Even if you are happy with your Amazon orders, there quickly becomes a problem of space. One series of comics can occupy an entire shelf. The addition of images just means it takes more space to store the same amount of story.
It was for this reason that I switched over to buying comics almost exclusively through Comixology.
There is little more to say on it, other than it is the largest selection of comics available instantly, and readable on computer or tablet, as you decide.
The only really bad point is that with access to complete backlogs of series's just two or three button clicks away makes it way WAY too easy to spend a couple of hundred dollars trying to find out what happens next in a series. And that's a negative I am okay with.