That is huge. The largest I have seen are the whiskey barrel at Lowes. I believe they are around 24-26" wide. I would look at the big garden centers like Merrifield.

I have purchased large resin half-whisky barrels from Costco in prior years. I don’t know if they still have them in stock but they are very sturdy and affordable.

Costco usually has a couple options.

Does anyone know where I can get a 30-36 inch round or square planter in person?