Large Rubbermaid Stock pond, 300 watt heater, and large canister filters

As the title sais, Im looking for a rubbermaid stock pond (150 gallons or 300 gallons), 300 watt heater, and some large canister
I can trade for a full 120 gallon setup, this pond will be for my rays which are starting to outgrow the 120 so i will no longer need the 120.
I can only sell the 120 once I get the stock pond up and running.
thanks!