iSky is the smallest of the iLiving range designed as a Skybox for a 512m plot.
At 15mx25m it fits into the majority of 512m plots available for purchase or rent in Second Life and uses only 29 prims to do it.
That's a little over 10L per prim and for your money you'll be getting a low-profile sleek skybox with a complete Home Control Suite.
Tour the Demo Skybox!
The iSky is also available in Pink...
..and Black: