I've been buying 16' LED strips from Amazon for $13.
http://www.amazon.com/gp/product/B002QQ1YOM/ref=wms_ohs_product?ie=UTF8&psc=1They can be cut to various lengths. About every 2", there's a mark on the strip where it can be cut.
I put three 5' long strips under the cabinets in the garage to illuminate the workbench below. Works quite well. There's an adhesive strip on the back of the LED roll. Peel -n- stick.
LEDs tend to be very directional. Narrow field of view. If you want to use LEDs for general lighting, you might be disappointed with the result. They are excellent for task lighting.