I can usually find what I need when making stuff but I can't find a cone out there in the real world. I need a plastic cone 1" at the base, and about 1.5" tall. Any ideas?

If it were around July 4th, I could find plenty in my front yard on burnt out rockets. I thought about the tip that covers a tube of caulk when it's partially used but I need the base to be wider. My MacGyver isn't working apparently.