glasscages.com quotes a price of $1313 for a 4 foot square aquarium with 3 sides being starphire, and the reef ready kit.
Fishtankshop.com quotes the same (without the holes drilled in the bottom) at $2150.
I don't need the bottom to be tempered starfire glass, or even glass at all to be honest. I've seen some people with PVC bottoms, although to be honest I'm not sure if that's glass or acrylic tanks, and I'm not sure if that's more or less expensive.
Also, I don't need this tank to be rimless, which would enable it to be constructed of less sustantial thickness of glass, which jumps down the price quickly.