Possible Clues:

• Fee on some out-of-state purchases
• Out-of-state purchase fee
• Out-of-state levy
• Levy on out-of-state purchases
• Charge for some goods bought from out of state
• State-levied fee
• It's paid on out-of-state purchases
• Line on interstate trucking invoices
• Nonprofits might not pay it
• Charge on out-of-state purchases