The Genesis event started on May 28th at https://microbuddies.io and is currently ongoing. 2500 Nano Factory Tokens are being sold to early adopters for 0.05-0.15 ETH each. These Factories will give birth to the original set of MicroBuddies (generation 0) that the rest of the game will spawn from. After the genesis event, propsective players will need to purchase a MicroBuddy from an existing player on OpenSea.
Players and collectors alike are able to list and auction MicroBuddies on OpenSea. The price of any given MicroBuddy on OpenSea will be determined by the market, and some MicroBuddies may have characteristics that command a higher market price as determined by market participants.