There are mint sets and there are proof sets, and they're not the same. Mint sets are ordinary-strike coins, selected for quality, and packaged at the mint so they're uncirculated and untarnished. Proof coins are specially struck on prepared blanks that give them a mirrorlike surface. They're minted separately from ordinary strikes and are intended only for proof sets.
Please post a new question identifying which type of set you have so it can be valued. Thanks!
The 10 coin set with box list at $33.00 retail
The Mint sells them for $52.95+$4.95 for S&H.
The standard 18-coin set has a average current retail value is $26.00, issue price was $29.95
The only U.S. Mint issued proof gold set dated 1991 is the gold bullion 4 coin set. It has the $50, $25, $10 and $5 gold coins as a set. Current average market value is $4,000.00.
Issue price was $12.50, average retail value $25.00
With original Mint packaging retail is $30.00 for a Silver Proof Set
Current retail value is $11.00 issue price was $12.50
6 coin mint set 1994
The U.S. Mint does not make "proof mint sets" of any year. The two types of sets have very different coins in them. A 1980 PROOF set has a current value of $5.00 and was issued for $10.00. A MINT set has a value of $8.00 and was issued for $9.00.
These coins are no longer in circulation since Irelands changeover to the Euro in 2002. Unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they have little or no value.
July 9, 2009 The Uncirculated US Mint set is valued at about $15. The 2005 US Mint Proof set is valued at about $25. The 2005 US Mint Proof set is valued at about $42.
July 9, 2009 The Uncirculated US Mint set is valued at about $15. The 2005 US Mint Proof set is valued at about $25. The 2005 US Mint Proof set is valued at about $42.
The 5 coin proof set has a value of $6, the 10 coin set has a value of $15 and the 10 coin silver set has a value of $48.
Current value of the 2003 10 piece Proof set is $10.00. Issue price was $19.95.
The 2006s 10 coin proof set has a retail value of $31.00 issue price was $16.95
A normal 1991 S proof set is worth $9. A 1991 S proof prestige set is worth $51.
In original box as issued from the Mint retail value is $84.00, issue price was 19.95