Eawakening via eBay offers this 49-Foot 6-LED USB Borescope Inspection Camera for $16.06 with free shipping. (Select 15 meters in the dropdown box.) That's tied with our mention from last week, the best now by $12, and the lowest total price we've seen. It features a waterproof camera and 640x480 maximum resolution.
Allow up to seven weeks for delivery.