Charger for asus ux31a zenbook laptop?

Hey! I am in Shanghai on a trip and lost my charger. I need to get a new one asap but have trouble finding information on yahoo in my cellphone ( China censurs Google...)

I think I need the ADP45-AW charger (?), I can only find it online at eBay for around 20$ which seems cheap for a laptop charger, but I couldn't find it on Asus official site as it redirects me to the Chinese version...

Could somebody with real internet verify this for me? Also, if anyone has knowledge of where I can find it in Shanghai that would be awesome! ( I was not able to find any genuine Asus store on yahoo)

Also, are there copies of this item floating around, and how can one distinguish a copy from a genuine device?