The entry level interface into Pro Tools is called the "mBox". It comes with a smaller version of Pro Tools called Pro Tools LE. The software offers the majority of the features that the full featured software comes with. It retails for $499 and is available for $449 from almost every music retailer imaginable.

I wouldn't recommend Pro Tools for regular consumer editing. There are plenty of other interfaces and programs available that offer just the same features and more for a lot less money. Pro Tools, as soundhound rightly states, is basically the industry standard. That doesn't mean there aren't other ways to do the same thing.

If you want more info, there are plenty of books out on the subject of home recording. As for websites, do a search for home computer recording. You'll probably get some insight there.

For starters:
www.homerecording.com
www.recordingmag.com
www.harmony-central.com