LightInTheBox offers four USB Night Light Touch Switches for $1.99 plus 50 cents for shipping. That's the lowest price we could find by a buck. It features two colors.

Note: This item ships from China and may take two to five weeks to arrive. Uncheck "Add Shipping Insurance to your order" during checkout to remove the 99-cent fee. Also, the countdown timer on the product page does not reflect an actual expiration time and resets daily.