I have a 55 gallon tank available, non-drilled (I can drill and install a bulkhead for you too if needs be for a nominal fee.)
The tank has only been used for a SW reef set-up, so it is contaminant free, leak free and in decent shape, up until replacing it within the last 2 weeks with a custom designed 55 drilled for a closed loop with a tank long external weir overflow it had been used for my display tank.