VillianSupply.com, For All Your Villianous Needs

From their site:

From Scaramanga & No, LLC, the world's #1 choice in villainous architecture and weapons systems, the Doomsday Star Satellite fires a single fusion-powered energy blast that instantly liquifies the Earth's crust, destroying all life. Be the envy of other supervillains. Orbital insertion not included.*

Price: US$1,200,000,000 (additonal 10% discount for recidivist VilAnon members)
*requires the Halex Diamond for beam cohesion; currently stored at the Pentagon's High Security Facility in Virginia.