I usually use the presence of a price to tell whether or not movies are available in stores
Currently, our database of existing videos isn't complete enough to be a good indicator. It gets better week after week, but it's a work in progress.
It would be nice to be able to simply filter out those that aren't available.
It could be done, but I have the feeling that hardly no one would use this filter. It would just make the interface more complex.
I think It would be convenient to rename "Existing video is available in stores" to some thing like "Videos that are available in stores"
Sorry, I don't see what's wrong with "Existing video is available in stores" and why I'd have to change it.