Multiple states with minimal income

My nephew is a professional musician and tours.  This year he has state income declared in CA (his state of residency), CT, IL, LA, MI, NY, OH, OK, PA, and TX.  TX has no state taxes and he's under the threshold for IL.  NY's income is substantial so I'll buy that state for turbo tax.  The other states are minimal, but require filing.  That leaves 6 states.  Is there a way to deal with those without buying 6 more state through turbo tax?