Scrap fabric from sewing bin: free.
Schedule 40 pvc pipe from brother in law: free.
2 electric conduit clamps from Ace hardware: $3.00.
Shade from homemade awning: priceless.
Simply sew 2 channels through the ends of the fabric, insert pvc. Clamp one end to rain gutter using a bolt and wingnut. Insert the other 2 pvc pieces into the jack supports below the ends of the sliding door. Flex the pipe to achieve tension and insert into elbow pieces on ends of pvc in second channel. Instant cheap shade.