Any further updates on this? Seems strange that they have stopped selling it.
I asked The Royal Mint, this was their reply:
"The Snowman 50p coin was part of our Christmas Celebration range. Therefore, when this popular product sold out from then current stock (noting all limited mintages did sell out), a decision was made not to replenish these lines in respect of unlimited mintage items as it was unlikely that new stock would be available until well into the new year".