I use the clamp on umbrella.
Bought several dozen at Wal-Mart several years ago now.
I was going to a car show every weekend back then.I was into my second summer of sitting in parking lots with NO SHADE.
Saw a ad for them on sale.Went in and bought just about everyone they had.
I'd carry an extra 5-6 with me to the car shows and sell them with zero effort.Folks were begging for shade.
