300 gal

Try your local Craig's List. Anything long-distance is going to cost more to ship/move than the tank itself. Also your local fish stores will be able to build any custom size tank you want, if you have the money to buy one new.
 
Agreed about the CL idea. I just went on looking around areas in the Delmarva peninsula and I found 2 for sale around the size you are looking for. Best of luck!
 
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