I bought a black Genesis 3 (wide cart, with side burner) last month for $50. The previous owner guessed that it was 15 years old, and had recently put in at least $150 in parts (PCI grates, flavor bars, cover)... but after building a bbq island, the Weber was just taking up space, and he was glad to get rid of it. Yes, it works great. No rust or rot in this climate.
The funny thing about it, is that the serial number under the control panel is for a Genesis 1 natural gas model. Which confused Weber when I called them about a couple of small parts. I think I asked about this in another thread here, a Weber employee had been posting but he's apparently gone now.
One could probably make a little walking-around money buying these grills on the cheap, cleaning them up and reselling them. But that's not a hobby I'm looking to get into. (I started watching craigslist for a WSM, haven't seen one yet.)