Toprank, it would help if you put your location into your User CP (link in the upper right area) so that people have an idea of where to send you to get things.
Resistors and capacitors. They often come in packs with tape strips of various common values; I have found it useful to buy these packs.
Get some 2N3904 or 2N2222A transistors, some LEDs, and a wall wart or two. It's easier to not have to switch batteries all the time.
Also, I find that a good breadboard with binding posts for power is helpful.
Torben