Fulllove360 via eBay offers this 6.5-Foot LED USB Endoscope Video Camera for $4.19 with free shipping. That's tied with our March mention and the lowest price we could find today by $2. It features six LEDs, 640x480 resolution, and 30 fps recording.
Note: It ships from Malaysia so allow up to six weeks for delivery.
If you aren't using any of these three methods for significantly saving on laundry detergent, you are washing money down the drain.