I tell you one thing: Id hate to take someone's used 500 only to find it has a leak! Not to mention the logistics of moving/shipping/installing the sucker. I'm aware of Cali's prices in the land I call "Shake and Bake USA". Don't know if some of those people got tanks before cost of living skyrocketed or not. I spent a whole summer in a student internship out there in San Fran/Berkeley/Oakland/Livermore and prices were nuts with several people sharing homes. And on the tanks they want to unload BIG fish too half the time. By the time you go through all that you may as well save up for a year and go new. Maybe someone posting her from Cali selling a big tank can explain their situation.
But I loved Frisco, though.
Here's typical east coast prices. To show how whack it all is my 225 tempered with a metal/paneled stand total was about $4750 four years ago. Your numbers may vary...
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