Make one. Get enough cardboard together and get your basic shape cut out. Attach the pieces together then cover the entire thing in a couple layers, or more, of duct tape. (Duct tape even comes in different colors and patterns now.) You can get the exact size and depth that you want.

Those large snack trays at Walmart come to mind. also the dollar tree has them for a dollar. A pizza pan maybe?

Google "20 inch saucer" and you'll see plenty. Most real nurseries will cary these.

tj

Those large snack trays at Walmart come to mind. also the dollar tree has them for a dollar. A pizza pan maybe?
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My thoughts exactly.

Maybe even an oil pan tray????

How big are 5 gallon buckets? Would a lid from one of those work?

Thank you everyone! The Walmart thing didn't fit properly. In the end, I managed to finally find one at Amazon that was big enough. Oddly all the ones I was finding were exactly the size of the bottom of the pot, which made the pot unbalanced sitting on it.

The only problem was that it didn't have any raised ridges to allow room for a pot to drain. So I remembered that I had a bag of large pieces of lava rock I bought a couple of years ago, and never used. I put a few of those in the tray, then set the pot on top. It works beautifully and gives it an interesting look to boot!

I'm so happy to have finally given my tree a happy pot. :)

I went to Lowes and bought a large black plastic drip pan for a water heater. I put a plug in the side drain hole and it worked perfectly and was cheaper than one for plants.