MiniInTheBox offers the Brelong Motion-Activated Color-Changing Toilet Light for $5.38 with free shipping. (Choose "Postal Service - No Tracking" shipping during checkout.) That's $4 under our January mention and the lowest total price we could find today by $2. This IP65-waterproof light features push-button sterilization with ultraviolet light, eight color choices, and requires three AAA batteries (not included).
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 49-cent fee