In the last couple years, there have been a ton of retail exclusives. There are a few distributors who won't sell us movies that have some bogus exclusivity, but you know who will? Best Buy. We just buy em there, and rent em out just like anything else. The only thing we can't effectively get a large quantity of are the Netflix exclusives, but those are usually more obscure movies(which my store specializes in).
What I really hate are the "Rental Exclusive" editions of movies which have long, unskipable previews before the movie.