I went and picked up some warehouse racking to do a couple tanks a while back. While it wasn't exactly cheap it did go together easily and is very stable. After doing a 2x4 stand for another system a couple months ago I still kind of with I'd jsut picked up more racks instead.
The place I got mine from is on 32nd NE at 18th ish, across from the Wendy's. I got a rack with 2 4 foot shelves for just over $100
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