Previous thread mentioned was my thread, and I can confirm the stick-on, motion-detected LED strips are SUPER. I love them, my wife loves them, they are great. It's also cool that right when you reach your hand onto the shelf, it just springs to light - no switch necessary.
In that thread, an Ali Express $4.50 led strip was mentioned, and i got them after about 2-3 weeks, and it has worked really great. It even came with a 3M sticky magnet that makes the LED strip super easy to mount. I'm waiting to see how long the batteries last (it is from Ali, after all), and it took 3-4 (can't remember) AAAs, so i would THINK it would last a long while, but time will tell. Anyways, great recommendation on that thread, and i recommend it for you too!