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If you aren't after lights as well then your best bet is probably the Igaro D1 (the guy who's developed this is on the forum - @acharnley) with a Shutter Precision hub dynamo. That'll be about £250, £100 for the Igaro and £150 for the dynamo built into a wheel.
If you want to find out more you're really wanting to post in the [dynamos][https://www.lfgss.com/conversations/232621/)/[dynamo lights](https://www.lfgss.com/conversations/159454/) threads. There's lots of information there.
We ride Dawes Super Galaxies and plan to tour in USA for two months next year. Which hub drive charger with usb outlets will we need? At what cost? Thanks in advance.