A 72 gallon tank, stand and canopy (Used) Would easily go for around 200$ around here. EASILY.. If the canopy and stand are in good cosmetic shape, you could probably get more than that.
I sold my 75 gallon RR tank, Stand and canopy for 250$ and the guy was very pleased with the price. If it was not drilled, I would have asked 200$. The stand even had come scratches and the canopy had some modifications to it.
If I could get a 72 with stand and canopy for 100$, I would jump on it so fast paint would peel from the money..
I owuld not hesitate to give the guy 200$ for it. I would of course offer less but would not blink at 200...
JMO...