Moon Property  
   Offers deeds for lunar properties.
   http://www.moonproperty.net/

MoonEstates  
   Offers lunar land parcels as well as moon-themed mugs, t-shirts, and baseball caps.
   http://www.moonestates.com

Stardatecards  
   Laser transmission of customized messages into space.
   http://www.stardatecards.com

Crystal Nebulae  
   Offers three-dimensional sculptures of astronomical objects.
   http://www.crystalnebulae.co.uk/

Moon Land  
   Offering one acre parcels of land on the Moon with deed, map, and mineral rights.
   http://www.lunarlandowner.com/

Planetary Investment  
   Offering moon property deeds.
   http://www.planetaryinvestments.com/

Lunar Embassy  
   Deeds for lunar and planetary property. Also offers clothing and other souvenirs.
   http://www.lunarembassy.com/

BuyUranus.com  
   An extraterrestrial real estate company offering title to a 1-square mile piece of Uranus.
   http://www.buyuranus.com/