Cost Plus World Market. I can't find it listed on their website anymore, but they are made to look like a vintage-style printed metal picnic tin with a lid. Since I've had zero luck finding any real specimens out in the wild, I was happy to plunk down $15 for this one.
I think I might put some Styrofoam down in the bottom and poke those pinwheels into the foam for a cute patriotic decoration that will work all summer long!
It was fun to create a pretty, vintage-style party setting even in the middle of a park, even if it meant half a dozen trips with a wagon back to my car to haul everything!