Look at the lighting area in a Lowes, or better on Harbor Freight or even Ebay, for some fairly simple pre-lit LED set-ups.
The other tips I'd give, look for Xmas lights post-season for cheap. They're pre-wired and have on/off switches. I usually go through picking up some electronics like that for cheap so I have some things handy that I like to have for wiring up LEDs. Halloween anymore is good too since places like Big Lots will have 3mm LED kits and such, and they'll have nifty colors like orange/purple to boot.
If you want white LEDs, Xmas obviously, but you can usually get a small strand with a battery box/switch for cheap after Xmas.
If you just wanna wire junk up, you just have to scour Ebay as there's tons of that junk for cheap from China.
At Harbor Freight they sell LED undercabinet lighting. Some of it is positional spotlights, some a slightly positional light bar, etc. You could even technically tear down one of their freebie flash lights and figure something out with it too.
Here's a linky to the HF stuff (but go to a store, it's cheaper to buy there):
http://www.harborfreight.com/led-under-cabinet-light-62893.htmlThe "problem" you wind up with a lot of the time, and Justin's pic illustrates it, is the light kind of intensifies in one spot there rather than even throughout the ovals (if that makes sense). That's difficult to not have that short of completely wiring something yourself so the lights are off to the side somewhat.