I'm fine with buying the work directly, but can you point to a good store which sells it simply as files with no DRM attached which I can download after buying? I don't need physical DVDs clutter, it's so much last century.

Sure, streaming as convenience is good to have. But it doesn't remove the need for personal backup. Network connectivity is not available always and everywhere, as well as you can't rely on the service to be always around. If you don't care to lose your extensive digital library when that service goes bust it's up to you, but it's a normal thing to care about it.