I found this booklight
http://www.solutions.com/jump.jsp?it...&keyword=87357.
It has 12 LEDs, and adjustable arm and bright/dim settings, and costs only $4.99.
I'm not sure if it can be used with an eReader because the clip looks like it only opens wide enough for a book cover,
but I thought I'd mention it in case anyone feels like taking a chance.