You'll have to take my word on this one. I posted this deal 4 months ago, and now Foxtel once again has this offer, although unadvertised. It was communicated to me by a friend who works at Foxtel and appears to be on-going.
If you're a Foxtel IQ or IQHD customer who has not ordered an adapter previously, simply call 1300 784 144 and tell them you now want your box connected to the internet to access on-demand channels. They will gladly ship you out 2x NetComm NP505 Powerline Adapters for every IQ box totally free of charge within 5 days. Can't ask for more than that.
Make sure you stipulate 'free' in your phone conversation, and take down a reference number for the call (just in case).