Walmart offers Game of Thrones: The Complete First Season on Blu-ray Disc for $19.96. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $4.97 shipping charge. That's tied with our mention from three weeks ago as the lowest price we've seen and a current low by $3. It includes digital copies of each episode.
Walmart offers Interstellar on Blu-ray / DVD / Digital for $18.96. Choose Site-to-Store pickup to dodge the $4.97 shipping fee. (Amazon charges the same for Prime members.) That's the lowest total price we could find by $7. It includes a second Blu-ray disc of extra features.