The presale ended earlier this month and the crowdsale should be alive with first registration and you can receive the contract address in 24 hours after sig up. Via this link you will get further info:
https://www.lamden.io/registration
Earlier today, the contract address has been published in official twitter channel of Lamden so everybody can purchase the sale without registration. Here the link to the official statut:
https://twitter.com/LamdenTau/status/943665841274486785