This is an amazing question! So sorry for the delay in response - was asking one of my good friends who launched a super successful collection on Solana :). ​ In short, you have to temporarily pay money to launch a Solana collection - but the good news is you can get it all back after your mint completes! ​ Tl;dr, on Solana, storage space needs to be rented. In exchange for storing the name and URI link of a single NFT, approximate rent costs are approximately 0.00167 SOL. ​ Thus, you can get the approximate total cost of launching a project on the Solana blockchain by just multiplying the number of NFTs in your collection by 0.00167 SOL! That means that if you're launching a 1000 NFT collection, you'll have to pay 1.67 SOL, or approximately $65 right now at depressed SOL prices, and for a 10,000 NFT collection, you'll have to pay 16.7 SOL, or approximately $650 at current prices. ​ However, you can get all of this money back after your mint completes! After your mint completes, you can call the withdraw command from Metaplex's Candy Machine CLI tool, and reclaim all of your rent costs. ​ Hope that helps! Here's the documentation straight from Metaplex on how this works: https://docs.metaplex.com/candy-machine-v2/creating-candy-machine