Enjoy more buffet meals at Vikings! Get 25% OFF on Vikings Buffet Vouchers with your Citi Credit Card or Citibank Visa Debit Card. Valid for a minimum single-receipt purchase of 4 vouchers. Buy as many as you like until June 30, 2016. Vikings buffet vouchers may be purchased at all Vikings branches nationwide. Vouchers have no expiry date and may be used upon purchase – prior reservations required.