Related Clues:

• Invents, as a word
• Corn or cotton
• "Walk the Line" subject
• It may be petty in the office
• Exchanged notes?
• Redeem, in a way
• Quarters, perhaps
• Dollar bills
• Hard currency
• Plastic alternative?
• They have heads and tails
• Billfold contents
• Nickels and pennies
• It's no charge?
• Credit alternative