I require a (hand operated) alternator / generator producing 10-30V, 5-30W. My budget is £20. I need delivery to UK within 2 weeks . It is for a prototype in a product design project, and if successful we will take the product to market and need to purchase many more of these.I have seen many small generators suitable, at between $5-$20, but the minimum order quantity is very high at 100 or more. Please can you help?Thank you.