Forgive me if this has been asked before, but are there any differences between a DVD purchased through a regular store and one through Columbia House? Are they all manufactured at the same plants? I am toying with the idea of joining to build up my collection cheaply, but I am hesitant. I recall joining record/tape clubs (RCA) many years ago which offered inferior reissues of different musical titles, with altered packaging. Thanks for the input, Thos.