Either buy prefabs, or build your own man. I got a quote for a box for 2 8" subs from a local shop for $ 600.00. I tried 3 different people/companies recommended to me here, and after answering all their questions, I got the same thing, there are people ahead of you. Well, no *****. This may sound nuts, but in all my years as an operations manager and sole proprietorship, I used this marvelous invention known as a calender. I could always look to the right and find a day on it where I would be finished with current customers work, and be able to move on to the next customers job. If I find myself having to chase down someone to give them my business, I can only imagine how things will go once they have my money. So, to sum it up:
A- Bite the bullet and hire the locals.
B- Buy prefabs and make do
C- Build your own boxes