Well, it seems that the best site, by-far, is the www.dvdpricesearch.com one.
One can get a comparison of all the outlets in an easy to read spreadsheet.

I looked at that itismovie one and they list all the very latest movies for sale at $11.90.
Most of the ones featured on the homepage are not even out on DVD. I wonder if these are "pre-order" prices or if these could be bootleg. That isn't possible...is it?

For those who are still giving my posts "the fish-eye" I'll reiterate. I have no hidden agenda. I am not a shill. I'm just trying to learn the ropes.