I own 3.5 Arduinos (one needs to be soldered together). I'm pretty sure I have more parts in/on/under my work desk than my nearest Radio Shack. I like to rescue broken things from the side of the road, today I found 5x 3mm red leds, a push button and 3 coin cell batteries from a toy that got ran over in a parking lot. I just saved like 75 cent!