Using Polygon blockchain is the key when you create an item!
"Create" does not cost anything
When you "Sell" these items using Polygon, it doesn't cost any gas fees!
You just need to "Sign" the transaction and signing is a free transaction.
So all these collection, I listed everything for free.
And I think there is no buying transaction fee either... so go ahead and buy some NFTs here 😉 https://opensea.io/collection/risu-glitch