The only way that "right" exists is as a penumbra of an emanation of whatever was going through the judge's mind.
What of the 4th Amendment? No, I don't mean the disgraceful joke the courts have made of it, so please don't direct me to some obscure omnibus law or court ruling that somehow explains away in legalese what the 4th Amendment clearly says. I mean the plain meaning of its words:
Amendment IV: "The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."
No probable cause, no warrant, no search.
So barring probable cause indicitive of a crime, accompanied by a warrant, there most certainly is a right to anonymously purchase reading material.
And that is only the enumerated right. Not all rights are enumerated. I submit there is also a 9th Amendment right to privacy that must be considered as well.