Land can be purchased on the Illuvidex, the official marketplace for Illuvium, or the Immutable X marketplace. Transactions will be based on the Layer 1 Ethereum network. However, minting NFTs will be based on the Layer 2 network via IMX, the Immutable X marketplace. So land is purchased with either Eth or the sILV2 token using Metamask on Layer 1 with additional gas fees. Minting the land on IMX will cost no gas fees.