Where do you live? 1,000 Island in Brooklyn is good, but I highly suggest that you "babysit" them during the build to make sure you get exactly what you want. They tend to do more of what they want to do, rather than what you want them to do. Guys here also order from glass cages, but I'm not sure they do acrylic.
Since it's going to come up anyway, I figured I would just let you know that most people who run reefs stay away from acrylic. It scratches way too easily and coralline algae will grow all over the acrylic and be difficult to remove without scratching. I'm not trying to discourage you from getting acrylic, afterall, anyhting can be done,but most here go glass for reefs.