I've searched e bay for years trying to find a decent Battle flag for the Alabama Brigade, If you want a "Plain Jane" flag then you might find one. But it will be GENERIC.
If you want something different, made to exact specifications, width of Bars, fimbration , crowded star patterns,or battle honors than you will be out of luck.
I finally had to make my own.
I can turn you on to a couple of good flag makers , drop me a line