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Aquatraders has the 72" for 150. You will not find a cheaper option for one t5 fixture at that size.
What are the dimensions of the tank. I was thinking of doing 2 36" fixtures for my tank but then you will be looking at 6 or 8 bulbs to replace every 6 months. Gets pricey quickly. If you want it to have a clear white then get away from any household fixture.