I've been at this for a few years. I used to organize a group buy through Phantom but have found better deals through wholesalers. This year I bought from Patriotic Fireworks in Elkton MD.
Patriotic Fireworks - Welcome to Patriotic Fireworks
Look at the this deal on aerial repeaters:
Patriotic Fireworks - Ultimate Aerial Assortment (16125)
it was $250 if you bought it before June.