Ozark Trail Chair Umbrella with Clamp, Black, Large 42"x42" (Chair Is Not Included), Adult use - Walmart.com
Amazon.co.uk: Chair Umbrella With Clamp
Amazon.com : STARRY CITY Chair Umbrella with Universal Adjustable Clamp,46 inch Sun Shade,Clip on Parasol for Patio Chair Beach Chair Wheelchairs Golf Carts (D-Blue) : Patio, Lawn & Garden