A 1999 US Mint 50 State Quarters Proof Set is worth about five US dollars. However, a 1999-2008 US Mint 50 State Quarters Proof Set is worth about 100 US dollars.
$6 to $85 depending upon which 1999 proof set you have.
Numismedia lists a 1999 silver proof set with a retail price of about $315 as of 04/2009.
The value of a quarter with a tree on one side would be 25 cents, as it is a standard United States quarter. The design on the reverse side of the coin changes periodically, but it does not impact its monetary value.
If the two dates are 1776 & 1976 It's a bicentennial quarter and it's still worth a quarter If it's a state or territorial quarter, has two dates on the back and one of them is between 1999 and 2009 it's also just worth a quarter. If it has two heads with a date on each side it's a magician's coin - see the Related Question.
If you're selling the entire set retail, a fair price would be around $250.00. If you go to a dealer, you'll probably be offered around $175.00. Now that's the short answer. Some years are more valuable than others. The 1999 set is worth around $35.00 retail where the 2000 set would be only $10.00. the 2001 jumps back to $35.00, then from 2002 through 2007 only around $15.00, then back up to around $35.00 for the 2008 & 2009. There wasn't a state quarter set for 2010.
25 cents
A 1999-S Delaware Silver Proof Quarter, certified as a PR-70 Deep Cameo example has a listed retail value of $3,000.00.
The 1999-S silver proof quarters are about $8.00.
$12.50!
Please check your pocket change. It's one of the billions of state quarters minted since 1999. Unless your coin is in proof or uncirculated condition it's worth exactly 25 cents.
The 1999-S silver proof quarters are about $8.00.
If you found it in change, 25¢. All state quarters (1999-2008) were minted by the carload and have no extra value when they're in circulated condition
State quarters were minted from 1999 through 2008, eventually featuring designs for all 50 states. The quarter is worth 25 cents.
Its value could range from $25 to $150 depending on how far off center it is.
It's just a state quarter that has been gold plated and it has no collectible value at all, unless you find someone that wants it.
All error coins need to be seen. Take it to a coin dealer for an idea of value.
The Wisconsin quarter came out in 2004, not 1999. It's worth 25 cents.