Background: Well, not all K40's are created equal. So I'll put this up with caveats and the "gotchas" that I found.  I hope that this will be of value to someone.   At this point in the market, the prices are dropping and quality is getting better.   Do some shopping, read the reviews.  Ebay has great prices but... and it's a big "but".. there's hidden costs such as duty, import broker fees, and getting it shipped from the port entry to your door.  There's also "service" which seems from review