I'd say call around to various decent-sized sporting goods stores in your area and ask who sells a 4 or 5ft. barbell. I got my 5ft. (when I used to live in Dallas) at Academy, but i know those aren't nationwide. If you have Oshman's, they carry them too.
I got little clips that work much faster than collars, but i usually have to pause the video to change weight safely even with the easy clips.
It shouldn't be hard to find a good barbell and feel free to try out the clips at the store. Oh, and one last thing: for plates, make sure you buy the right size or buy the right barbell for the plates you already have. They have two different sized holes. I didn't pay attention and learned my lesson years ago when i carried home a bunch of the wrong-sized plates.
Cathe has links to info on all the equipment from her home page too.
Ginger