I'm trying to learn how to mint NFT's in an economic way. I have some experience with smart contracts but it's a while ago. I have looked for an answer to this question but could not find it.

I have deployed this contract on testnet: https://github.com/0xcert/ethereum-erc721 and created an NFT by interacting with the contract.

Deploying the contract is very expensive on main-net, much more so than interacting with it.

Now I was wondering: isn't there any deployed contract on mainnet already? That I can use to mint an NFT? In the link that I provided there are some contracts listed on testnets, but not on main net. Does anyone have a suggestion for this?

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