I use Warm and Natural, which says every ten inches. I also recently bought a roll of polyester batting and another of 80% cotton/20% polyester that each also say every ten inches. So, yes, there is batting out there that allows for more than 2-4 inches. (I bought these two rolls at a quilt show, but here is their web info, in case anyone is interested.
http://www.americanquiltbatting.com/category-s/1818.htm Their prices were reasonable.)
Dina