Sorry, I was kidding about RS: you should try to avoid them at all costs! Try a local store instead of corporate if you can, it's almost always a lot cheaper... my local supllier will sell me 100 1% resitors for $1 CAD, whereas Radio Shack want $2 for five. Suport small business if you can-- it's the Arduino way!
Ok no problem, I can probably find one around here. Actually Sparkfun seems to have them and there not to expensive.
thise are 12V leds, with integral resistors.. you would neeed a separate 12V power supply for them, but sure they'll work. You could power the Arduino from the same 12V supply. For something expensive like super-bright led's, you might want to try Digikey.
So will they not work because of the resisters? How would you wire it up for a 12v source and still use the Arduino? Also does any one know how I could water proof the leds (and their wiring) . They will be in a spot that they might get wet.