Got mine from Modeltech, website says they're in stock:
http://www.modeltech.co.uk/catalog/p...roducts_id=742
I've seen this overheating thing come up a few times, I guess it must be an issue on some of the chargers, I would suggest people take them back to the retailer I don't think it's 'by design'. I've regularly used mine on 5 amps for long periods without problems.