Cloud.af - 4500 USD (Cloud.com was sold for more than 200 million dollars)
SEO.af - 4500 USD (SEO.in was sold for 18k USD)
Map.af - 1000 USD
Computer.af - 800 USD
Free.af - 500 USD
Registrar: Hexonet.net
af=advanced firm or advanced forum, some creative stuff you may create.