Where can I buy the cheapest good dynamo, hand-crank, bike-powered, or solar generator online?
“Cheapest” would be to check CraigsList.Org or FreeCycle.Org for used ones which people are giving away or throwing out. Solar panels tend to be relatively more expensive and are “maintenance free”. Automotive alternators produce the most power, and therefore require the greatest mechanical effort to do so. Bicycle generators are probably the most practical, provided you have a stand or stationary bicycle. I have seen bicycle and hand-crank generators available inexpensively ($3 to $7) at discount & dollar stores. “Cheapest” on Amazon: —————————- $10 Hand-crank 5-Volt charger http://www.amazon.com/Illuminator-Powered-focused-flashlight-charger/dp/B000HF2RVI/ $10 Bicycle 6-Volt generator http://www.amazon.com/Cycle-Force-6-Volt-Generator-Bicycle/dp/B0009W7F1G/<