Great deal from watchwarehouse_uk on eBay. It's radio controlled and solar powered. £128 on Amazon.
I almost purchased the G-Shock posted earlier for £44.99 but imo this is more visually appealing and thus worth the extra.
Was £135 and this is the cheapest I could find this model for. At least at 4:30am via my phone!
The only thing I'm not sure of, is how many are available?