PCGS puts this coin at $175 in this grade.
To explain what it is goes back to the beginning of the series. The mint paid the designer of the coin, Glenna Goodacre $5000 in specially burnished
Sacagawea dollars, these were minted in Philly. Some of these coins were sold by Goodacre through an agreement with ICG, who slabbed and numbered the coins. The mint also ran a mintage of about 75,000 burnished 2000-D pieces which look similar to the Goodacre dollars. These were sold in the Millenium Coin & Currency sets. MS-67 is the high end of what was typically found in those sets, coins above this grade are extremely rare and sell for thousands of dollars.
Essentially, this is a semi-key variety for the series and should have commanded a price of at least $100 on
ebay, had the seller proof-red their listing.