Where can you still find good DVDs to buy?

You'll find used DVDs most reliably on eBay or Kleinanzeigen, since people are constantly selling off their collections there. New films, though, are tough to come by - some of the bigger retail chains still have a small selection, but it's just shrinking all the time. Your best bet is probably checking online shops like Amazon, which have less selection than they used to, but still have something to offer.