Your local public library likely owns Interstellar on DVD (480p). Borrowing is free and legal.
If you need an article promoting the actual availability of Interstellar in high quality from official retailers or streaming services, I am happy to write that. But I cannot and will not write content that aids, describes, or endorses piracy. -Movies4u.Vip-.Interstellar.2014.480p.BluRay.HI...