$6 to $85 depending upon which 1999 proof set you have.
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Numismedia lists a 1999 silver proof set with a retail price of about $315 as of 04/2009.
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.
The current value of a 1962 US proof set is $29.
The current value of a 1950 proof set is $750.
The value of the set is dependent on condition. However, the proof set value is between $50 and $70 US.