Now that Samsung is making LED lightbulbs, maybe they'll be cheaper

Warning: STICKER SHOCK!

Something the article below ignores is the greatly extended life of LEDs: 20,000 hours for the light output to halve is typical. When your 100 Watt equivalent LED globe has done 20,000 hours (that's the equivalent of over 2.25 years continuous operation), you can move it to somewhere that requires a bit less light. 

http://www.gizmodo.com.au/2011/05/now-that-samsung-is-making-lightbulbs-maybe-theyll-be-cheaper/