I just found a place on the web where you can purchase individual components on MB or other things.
WWW.DIGIKEY.COM
I just finished ordering 12 capacitors to repair two MB that have the "leaky capacitor" problem. It looks like there is a nice listing of other components as well. So here it is, for those of you who dont want to go to Radio Shack to get your stuff :P
Most things you can order a quantity of one but there is a charge of $5 for orders under $25 and shipping using priority mail (2-3 days) was like $3.50 for my single order.
enjoy!