I had a tarp shop make one since I wanted it in white and the only ones I could find were black (79 shorty stepside F100). I used the old school snaps since they fit the era of the truck and had them sew on some velcro loops to where I could roll it up when needed. I think it was around $250.00 installed, like 9 or 10 years ago. They also made a Ford Blue Oval in the center of it, well, it was just stitched, but it looked good.

If you want black places like JC Whitney should have them, they'll more or less be univeral with velcro strips but they'll work. You might be able to find the tri-fold ones as well that you don't need the hoops for.