Video stores usually get the DVD Screeners about 1 1/2 to 2 months (sometimes longer but in general) before the actual DVD is to be released in order to preview it and then try to figure out how popular it may be at their store (this also varies from store to store) and order the appropriate amount (for the actual DVD release) for their store.
If you have a friend who works for one, you may be able to convince him to let you borrow some of these and in turn rip it with X software and upload it to Y (or you may be able to get with a scene group who are looking for this sort of thing).
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