N.H. Rev. Stat. Ann. § 622:27

No goods, wares, or merchandise, manufactured, or mined wholly or in part by convicts or prisoners of other states, except convicts or prisoners on parole or probation, shall be sold on the open market, or be sold to, or exchanged with, an institution of this state or with any of its political subdivisions, except under arrangements which have been entered into between the commissioner of corrections and another state's correctional institution engaged in industrial activities.