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The 40% proof silver set was a 3 piece.
1964 proof Kennedy halves are 90% silver, 68, 69, 70 proofs are 40%. The 3-piece Bicentennial silver proof & silver mint sets are 40% and 1992 to date silver sets are 90%.
With original Mint packaging retail is $30.00 for a Silver Proof Set
The quarters, half-dollar and dime are struck in 90 percent silver, generally referred to as "coin silver."The silver proof quarters weigh 0.180845 oz - multiply that by the current silver price to get the value for that coin.
Numismedia lists a 1999 silver proof set with a retail price of about $315 as of 04/2009.