Sadly, the hField Wi-Fire is no more. hField Technologies ceased production a while back and so I am no longer able to source any more stock. It was largely due to the lack of a fix for a bug that rendered the adapter unusable with Mac OS X Lion and above. The Wi-Fire still works with Windows XP and Mac OS X up to Snow Leopard (and most version of Linux available up to 2010).
Its a great loss as the Wi-Fire was one fo the best (if not the best) high power wi-fi adapters on the market. Certainly the fact that its no longer ion production has meant the end of my own business as the Wi-Fire was a big part of it and the main reason I set my company up was to market it in the UK and elsewhere. I still get enquiries about the product but sadly have no stock to sell anyone. I also still get the odd call for support, which I gladly give where I can though as the company no longer trades I am not able to accept returns. Its a while since I sold the last unit anyways and certainly more than the 12 months guarantee period. As long as you are using Windows (up to XP for sure or OS X up to Snow Leopard) the Wi-Fire still works as well as ever.
There remains the possibility of a new product from hField though I have no firm details. I will certainly post the news here if anything comes of it.