There are plenty of options:

  • Bearer Bonds
  • Metals (like Steel)
  • Stocks
  • Commodity Contracts
  • Crypto-Currency (no surprise there)
  • Prepaid Debit Cards with the amount loaded
  • Travelers Cheques
  • Store Vouchers (Gift Cards)
  • Fuel Card Vouchers
  • Loyalty Points on Hotels and/or Frequent Flyer Miles