My total: $37.75
Of course I did actually spend more than that because I couldn't buy the exact amount of the materials that I needed. But still, I was impressed that it didn't cost more! The facing fabric is from a 5x12 canvas dropcloth that was $14.97, and the blackout lining (the most expensive part) was from a discount fabric store for $6.99 per metre. All the rest of the stuff came from Home Depot and Fabricland (just the nylon cord is from the expensive fabric store).