Assuming the coin is circulated, the 1897-O Morgan dollar is a better date New Orleans Mint coin. For an accurate assessment of value the coin needs to be seen and graded. In general retail values for low grade coins are $38.00-$40.00, better grade are $41.00-$50.00 and coins showing almost no wear run from $80.00-$275.00. Values are a market average and only for coins in collectible condition, coins that are bent, corroded, scratched, used as jewelry or have been cleaned have little or no value to a collector or dealer.
The New Orleans Mint coined Morgan dollars from 1879 to 1904, so you need to post new question with a date.
The 1897-S MORGAN dollar is not scarce or rare, an average retail value for the coin is $26.00-$32.00.
The 1897-S Morgan is a high mintage, common issue. Retail values run from $32.00-$45.00 for circulated coins.
Post new question with The Mintmark please.
$15 to $20 depending on condition and variety.
$15-17 retail for a coin in average condition.
1921 Morgan dollars unless they have an exceptional strike and are virtually perfect generally sell for about their silver melt value, about $25 at current melt value.
$27 to $1300 depending upon the condition of the coin.
About $17 or $18, or more if silver rises dramatically in price (as of January 30, 2008, silver is $16.76 per troy ounce and the Morgan silver dollar has an Actual Silver Weight of 0.7734 troy ounces, giving it a "melt value" of about $12.96). Note that there would be no "P" mint mark - coins produced in Philadelphia at that time had no mint mark.
Assuming you mean a 1896-P {minted in Philadelphia} graded as MS67, the value is $6,500. If it is in "proof like" condition the value is $13,000.
As of 09/2009 the melt value of a Morgan dollar is about $8 to $10. However its collector value can be much higher depending on its condition and mint mark.
Assuming the coin is circulated, retail values run from $23.00 to $35.00. The Philadelphia issue 1888 Morgan is very common.
The value varies greatly depending on factors like the date, mint mark and condition. One is currently worth at least $22 for the silver content, but for a specific value, ask about a specific coin.