That will probably change. Pricing jockey's back and forth, but eventually reaches equilibrium once supply and demand themselves do; and unfortunately, it's trending higher. Here, LF chrome film is more somewhat more expensive overall if you factor in processing, wherein E6 often carries a surcharge above C41. And it's harder to locate 8X10 processing either way, versus 4x5. The wild card, 5X7 processing, or 11X14, is even harder to locate. The same kind of dip n' dunk machines might be used for all these respective formats; but not everyone has all the various film carrier sizes on hand. But here in California, all the options are available cumulatively, one lab or another.