Amazon has 2001: A Space Odyssey 3-Disc 4K UHD Blu-ray + Blu-ray Set (2018 release) for $12 with free shipping on $25+ or with Prime. Currently $25 at Best Buy and Walmart.

The Stanley Kubrick sci-fi classic was remastered for 4K (from an 8K scan of the original camera negative) under the supervision of Kubrick's longtime assistant and includes commentary by stars Keir Dullea and Gary Lockwood. A collector's item!