The Harbor Freight 27 LED flashlight, Item # 67227 or 69567 is a great deal, even if you just plan to use it as a flashlight. The list price is $5.99, but it's very easy to find coupons online or in your local newspaper ad to get the flashlight for $3.50 or less. And it comes with batteries!
The flashlight is an absolute godsend if you have a use/need for high brightness LED bulbs. The 27 LED's in the flashlight each have a forward voltage of 3v and a forward current of 50mA. In comparison, white LED's cost $2.50 for a package of just 2 at RadioShack.
With just a soldering iron, a multimeter, some wire, and a "third hand" (either store-bought or homemade
), you can extract all 27 LEDs for whatever nefarious purpose should suit you.