A "Sold Out" landing page is high-value content because it turns a negative (unavailability) into a positive (desirability). It suggests the HiWEB x SERIES collaboration successfully tapped into a hungry market niche.
The website is still live, but the "Add to Cart" button has been replaced with a permanent badge. You can browse the archived documentation, watch the teaser videos, and read the technical whitepaper. However, you cannot purchase the core bundle. Sold Out -- HiWEBxSERIES.com
We don't know. But we will be watching.