Make 100% sure you can drill your 90g. My new 90g is all tempered glass which is undrillable.
The price is a bit high - a new 90g tank pre-drilled is well under $400, and they depreciate fast. The stand may be worth something if its a higher end model. The only thing of value is the live rock otherwise, if it hasn't been neglected and covered with pest algae and other stuff.
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