This will depend on the coin's condition. Well-worn, it might retail for about $3. That value could jump up to around $30 if the coin is in nearly new condition, so you see that knowing the amount of wear is very important.
More details:
Numismedia lists the following approximate retail values as of 06/2010:
Very worn condition - $3
Moderately worn - $8
Slightly worn - $18
Almost no wear - $62
Uncirculated - $86 to $5,530 depending on quality
Most of the 1900 Liberty Head Nickels have heavy wear and valued at $1.00-$2.00 retail. Better circulated grade coins can run from $5.00-$15.00 and up
4-25-11>> A 1900 Liberty Head Nickel has a value of $3.00-$5.00 for a coin in average condition.
It's the usual practice of this site to answer a single question at a time. Please see:"What is the value of a 1940 US nickel?""What is the value of a 1942 US nickel?""What is the value of a 1944 US nickel?"
A U.S. Liberty head nickel dated 1900 is common. Most have values of $1.00-$3.00.
This design is called either a buffalo nickel or an Indian head nickel; both names are about equally common. Please see the question "What is the value of a 1919 US nickel?" for more information.
This is a common date Liberty Head nickel. Most have heavy wear with values of $1.00-$3.00.
4-25-11>> A 1900 Liberty Head Nickel has a value of $3.00-$5.00 for a coin in average condition.
About $2.00 if it's grade G-4.
It's the usual practice of this site to answer a single question at a time. Please see:"What is the value of a 1940 US nickel?""What is the value of a 1942 US nickel?""What is the value of a 1944 US nickel?"
A U.S. Liberty head nickel dated 1900 is common. Most have values of $1.00-$3.00.
This design is called either a buffalo nickel or an Indian head nickel; both names are about equally common. Please see the question "What is the value of a 1919 US nickel?" for more information.
A very common coin, average value is $2.00-$5.00 for most coins in average circulated grades.
The US nickel was first issued in 1866. Please double-check your coin.
This is a common date Liberty Head nickel. Most have heavy wear with values of $1.00-$3.00.
Please don't assume that just because a coin is old it has to be made of silver. US nickels only contained silver during WW2. All others are made of 75% copper and 25% nickel. There's more information at the Related Question.
5 cents.
A 1957 nickel is worth face value only, unless it's uncirculated or a proof coin.
In average condition, both coins are only worth their face value.