Any windows in play on the side walls where you'd need blackout? If not, it opens the store bought options up a bit. Side note, the Home Depot set that Mediaman listed above does have a 120" x 100" variety, so you'd have your 10' height to use a ceiling track. You'd just want to see if you could find a display to determine for yourself if the reflective nature is too much. Incidentally, of the store bought versions I looked at, the Home Depot one was not as bad as some others. From what I recall, they were a bit lighter than the Triple Black from JoAnn and definitely more reflective, though not to the point of shiny sparkly that some were.
For me, in addition to my main drapes, I needed some custom slant shaped curtains for the wall, so I just bought the fabric I wanted and found someone close by who could make the drapes for me.
Remember, no matter where you go... You're not where you were anymore.