• Allied Electronics
  
• America II Electronics
  
• Digikey Corp.
  
• Future Electronics (good selection, a bit expensive)
  
• Insight Electronics
  
• Jaco Electronics
  
• JDR Microdevices
  
• Marshall Industies (part of AVNET, huge bulk ordering)
  
• Mouser Electronics (expensive, small selection?)
  
• Newark Electronics ($250 minimum for intl orders)
  
• Nu Horizons (big bulk ordering)
  
  
• Pioneer Standard Electronics
  
• Powell Elecronics
  
• Sager Elecronics
  
• Time Electronics
  
• Arrow

This list came from Sean's Springboard