Hey Punisher,
I've never seen a stand with six shelves, but I do know of a place in Toronto that sells brand name shelving units for very very cheap prices. I called them a while ago when I was looking for a shelving unit and the lady I spoke to actually navigated Best Buys website with me over the phone, indicating which units they had in stock and what their price was. I was floored when she gave me their prices.
I just thought, you could probably stack two identical shelving units together and just secure then with a large pipe clamp or something similar (painted of course). Most legs on shelving units are round; just a thought. .
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