Opensea charge between $70 and $100 dollars when you setup your account and you want to start selling on the Euthereum blockchain. However, you can now choose to mint NFTs on the Polygon blockchain and there is no setup fee and it can be done completely for free.
Take a look here at Opensea.
Opensea have just announced their own Venture fund, Opensea Ventures. The fund will seek investments in startups working in domains such as NFTs, DeFi, blockchain, and others. OpenSea co-founder Alex Attalah will lead the venture fund.
The fund will focus on startups that produce NFTs, create NFT protocols, produce blockchain and metaverse games, and develop NFT analytics.
This seems like a natural next step to build out an ecosystem fast and potentially tie down some assets for exclusive sale in the Opensea platform.