Can you confirm whether there are visa on arrivals at Guangzhou airport

My wife and I have been directed by our Chinese supplier to attend a tender process in early January and we do not believe we will have time to arrange a visa through the embassy in Canberra. Is this visa process available as we have letters from the company and confirmed hotel bookings. Or do you believe if we send our passports they will be back in Darwin prior to our departure which will be the 5th of January 2013