The value of a 2005 bison nickel is available online at NGCCoin.com and PCGS.com, as of 2015. The United States stopped minting buffalo nickels in 1937. There are many criteria that coin appraisal websites and companies use to value coins, including condition and proof or mint designation.
The Professional Coin Grading Service prices regular 2005 bison nickels at $1 for proofs and mints, with price fluctuations based on condition. The 2005 Speared Bison nickel is considerably more valuable in any mint condition due to a minting anomaly. The Numismatic Guaranty Corporation values 2005 mint bison nickels more variably: around face value for lower-quality coins to hundreds of dollars for the best condition.