How much is the uncirculated 1999 US Mint Proof set worth?

There are two different sets of coins released by the US Mint every year.

The uncirculated coin set contains one coin of each denomination from the Philadelphia mint and Denver mint. These are called P-D sets. This set will have twice the number of coins as the proof set for the same year. For 1999, the uncirculated coin set has 18 coins total and is worth $23.00 according to numismedia.com.

The proof set for 1999 contains 9 coins and is worth $55.00.