I'm trying to acquire the last two coins from this set to complete mine. The prices are way out of norm for 2019 and older. Is this a case of these being relatively new coins are there is more demand than supply? The two coins I'm looking for are the American Samoa and the Tallgrass Prairie coins. They seem quite high in price average $18-$20+ raw. Should I wait until the dust settle? I already bit the bullet in the 2021 two-coin set. Should I buy the whole set and sell my remaining 3 coins? Thanks!