Amazon (UK) has Seven Worlds One Planet (4K UHD + Region Free Blu-ray) on sale for £19.99 (price drops in cart) + £3.08 shipping = £23.07 or ~$31.01 USD.Please Note: The total price will be lower if you pay with a credit card that doesn't charge a foreign transaction fee. Switch and pay in GBP instead of USD during checkout. Refer to the forum thread for additional details and discussion.
Amazon.co.UK has Planet Earth II: Narrated by David Attenborough (4K UHD + Blu-ray) on sale for £12.49 + £3.08 shipping = £15.57 or $19.88 USD. Amazon.co.UK also has Planet Earth II & Blue ...
Amazon (UK) has Region Free 3D Blu-ray + Blu-ray Sets on sale for $11.69 (prices drop at the checkout page).