$52.95, I think? At least, that's what the 2016 sets are going for now, and I assume the 2015 cost was identical. It would have varied, of course, with the price of silver.
The prices are beginning to increase on the 2015 sets. It may be a short term thing but I'm thinking that they will have some up-value considering the low mintages. Here are the latest sales volumes (returns and audit adjustments) versus market values. Set Mintage Market Value 2015 Mint Set 314,036 $36 2015 Clad Set 662,900 $40 2015 Silver Set 387,414 $65