I buy 40, 60 and 75 watt incandescent light bulbs. Mostly 60s. They pop often enough that I keep a good supply. Just bought a six pack of 60s the other day.
I have wondered if the recent incandescent bulbs (last 2-3 years or so) are of lesser quality than in the past. After all, the manufacturers know that they are on the chopping block and need to produce the NEW and Wonderful ....OH Wait: I lost my train of thought..what IS the latest GREEN BULB..? I think the CFB (w/mercury) bulbs are falling from favor...and maybe it's now LED...........
Whenever you figure you have it figured out...Voila ...NEW Rules.

NB
Here's the latest stuff from Washington:
http://thehill.com/blogs/e2-wire/e2-...se-in-on-jan-1