Did I miss something? Sunfire is still in business, aren't they? If you want a Sunfire amp, there's many legitimate dealers that can sell them online. Ebay is an option, but I'd stick to sellers with copious positive feedback. I consider Audiogon to be safer overall, with (generally speaking) a more reputable pool of people. Same advice regarding feedback.
On all accounts Sunfire amps are fine peices of gear. I know many satisfied owners. They provide a lot of power with a good dollar per watt ratio.