Exclusive, and limited skins are for sale now at the marketplace.
For the time being the skins on sale are GEN 0, and as such will never be produced again.
Your skins, and starter packs, are Ethereum-based NFTs (non fungible tokens) which means that the user (aka you) has true ownership over the items bought. NFTs are also interoperable between many blockchain games.
Another thing to consider is that by acquiring skins, and starter packs, you're helping to fund the development of CryptoWars, and all future blockchain games created with <3 at Experimental.