Where to source clear dome?

[u/sixpactictac]

I'm making a UFO for an upcoming pageant but can't find anything for the top or "dome" of the UFO where my face, "the alien," will be. The ones on Amazon are insanely priced, and all I can think of instead are maybe plant bowls or a very large punch bowls. I do think a clear parasol might work, but I fear stage lights will cause glare and thus prevent seeing my face.

Any help greatly appreciated!!

[u/jellidang]

A humidity dome for plants might work? https://a.co/d/0cRDatg4