He probably just buys them from offices and studios (and individuals), refurbs them and then lists them for sale. I originally had eight A4000's (all new btw) and have sold a few on eBay - I got them from a former Amiga retailer's warehouse where they sat for 8+ years. I'm sure if some guy in Canada can find a lot of 4000's some guy in Germany (way more people way smaller area) can find more of them. :-)
