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eBay unfortunately. UK Seller who already part refunded me the cost of external battery charger due to USB port snapping off shortly after using it (apparently you should open it up an coat it in hot glue as it's common)
I couldn't find one as cheap as I bought it and they wanted me to pay for returning it so I'd be out of pocket.
I've formatted it again and will see if the problem returns if so it's going on my helmet (oo er) if it doesn't return after that, then on the lid it stays as much as I hate it being there.
I bought the one you linked to :) and it worked fine for two weeks.
It hasn't started overwriting yet so it is plausible, assuming my ignorance about how flash is written, that it has dodgy sectors.