Hi :) Sorry we missed this question, and hopefully you found what you were looking for already!

Nexus are currently available only on the secondary market, which you can browse at OpenSea - https://opensea.io/collection/championsarena

They're individually numbered, so they're a little tricky to search for. Just scroll down a ways in the collection to find the lowest-priced Nexus listings.

We're psyched about the upcoming implementation of Nexus into the game! More info coming soon 😉

Hope that helps! Have a great day :)