After fighting a few minutes getting it to light. Batteries are included, they just didn't want to work right away.
Let me just say... I LOVE THIS THING. Brian can go to sleep and I can actually turn off most of the lights in the room and still see to crochet. You have to get used to the feeling of the grip, and the yarn slides funny off the plastic, but it's awesome. I might have to invest in a few more of these to keep around.
There are several places online that have them. They are available in sizes C/2.5mm to K/6.5mm.
Hope you enjoy them as much as I am.