What is a 1997 nickel worth?

A 1997-P 5 ¢ Jefferson Nickel is worth $250 - $300 and up. It would be worth $250 in poor condition, but in mint condition it is worth up to $800. There is one on Ebay selling for $600, and this is the link http://www.ebay.com/itm/1997P-NGC-MS67-6FS-Jefferson-Nickel-SIX-Full-Steps-Registry-Coin-/300655679931?pt=Coins_US_Individual&hash=item46007999bb#ht_1192wt_1037