For our kitchen, we purchased a series of tape lights from ET2 Contemporary Lighting. Our system is hard-wired and includes a remote transformer that we hid in the cabinet above the range hood. Since the bottom of our cabinet is at eye-level, we chose to install an inexpensive aluminum angle to hide the strip and connector wires.
Like most LEDs, the color reads a bit cooler than a traditional incandescent, but I find it works well in a kitchen setting. In terms of cost, many brands seem to be about $30-$40/lineal foot (not including the transformer), although I noticed recently that IKEA has expanded their selection of LED fixtures and now offer several similar (less expensive) options including plug-in versions. It should be noted that LEDs last for at least 25,000 hours (compared to 1,000-2,000 hours for a standard incandescent bulb), so a higher up-front cost can be worth the savings in replacement bulbs and energy usage. Related Posts: Lauren Zerbey)