Not really worth it. I'm guessing you are pretty new to this, so I would wager breadboard friendly components are going to be your best friend. Salvaging parts from old electronics will mean leads being clipped to short to engage the breadboard, electrolytic capacitors that can be dried up, and ic chips that do things you have no idea what it is.
Most of the parts a beginner would use are actually pretty cheap. Learn what you need and visit a electronics supplier like Digikey to buy them.