I know that an improved SF III+ is available for considerably less than $300 from ARC mania. They are new and available now.
The cool factor of the Super Flashlight III light makes the light worth having. But that is not all. The build is excellent inside and out. The whole light is massive and has a nice, heavy, feel to it. You should see the thickness of the body. Yup, very heavy duty. You'd need to see the light in person to see how overbuilt the light is. The light feels like a quality piece of machining. And the light is good and rare.
It is a big light and feels good in the hand. It makes an excellent 'door knocker.' The light with a SuperDownConverter (SDC) makes the light perfect for running 2xCR123A or a Pila 168S (17650) cell.
As for a $300-ish price for the light I think that is high. But if that is what the market is paying for the light then I suppose you could get about the same price if you sell it. If you owned the light I really don't think you'd be selling it. I know my SF III+ light would be one of the last ones I would sell if I had to.
You wouldn't have to pay the $300 price if the newer version that was better and cost less were available now. The light even comes with its custom designed holster that holds an extra battery.
The SF III+ has a new body and a more efficient SDC 1000 (buck converter). I use CR123A primary cells, JSBurlys 3.0V rechargeable cells and Pila 168S (17650) cell in my light.
While ARC mania is waiting for the KI-T lights to have the laser engraving done he has the parts and the time to make Super Flashlight III+.
I know I like my SF III+.