It isn't a particularly large space. Simple. Evenly spaced. Can't cost $400. SRSLY.
So I bought a refurbished Brother sewing machine on Overstock.com. $109.
I bought 3/4 of a yard of cool fabric with an embroidered dragonfly detail from The Hobby Lobby, on sale for $13.
I made a simple pocket for a spring form rod ($3.99).
I did a simple hem at the bottom.
And .. voila!!
So, for less than $150 including the machine, I got what I wanted. And now, I am so enthused, that I plan on making simple slip covers of washable duck cloth for my patio furniture!