I can pick up Crank for $5 at just about any local store. That movie's not really a good barometer for BD prices.
Dan has a point.. most "cheap" online retailers, especially those that look a little shady, are cheap for a reason. IMO, it's not worth saving a buck or two. The old adage "If it seems too good to be true, it probably is" holds especially true when shopping online..
I always buy my discs from reputable sellers. If the movie's worth my money, then it's worth buying it at normal sale price (which is usually far less than MSRP anyway), rather than waiting for it to hit the bargain bin, or spending way too much of my time looking for deals to save less money than it costs to buy a hamburger.
Welcome to Rivendell, Mister Anderson.