bibre:
Jameco www.jameco.com/
I use Jameco when I need parts today, and it's Monday through Friday before 5pm, and I can get away from work before 5pm. This is because I live nearby 
I use Digi-Key for components otherwise. They have fantastic packaging, ship the same day for most orders, and takes about 2 days (Saturday delivery included) for a pittance in shipping with the USPS. However, whenever paying shipping, I make sure to batch my orders, so I don't pay $5 for shipping a $0.80 part... Also, I always get at least 3 of any part (not true for boards; that would be too expensive
www.digikey.com
All Digi-Key packaging is paper/cardboard based, so it recycles and even re-uses easily.
Also, digi-key has much better parametric search than Jameco on their web site. Parametric search rocks!
For more "built" items, I've ordered from adafruit, sparkfun, and iteadstudio, and all of them worked as advertised. iteadstudio PCB service + DHL shipping takes less than two weeks and is less than $50 for 10 custom PCBs of your design.