All boxes are not equal, here. Top be specific, I pay $26.61/50 for B flute, custom-printed white boxes. I give $17.55/50 for generic Starr 16" E flutes. BJ’s wholesale sells some E flutes, but I don’t know the price off hand. Less than mine for sure, could be $16/50.
B flute (1/8") is about twice as thick as E flute (1/16"). B uses more paper than E.