Finishing 2nd on the Christmas Event 2020 coin-collecting leaderboard is the only way this knife ever reached anyone's inventory, so there is no shop, box or event rerun to farm it from. If you are hunting one, expect to negotiate directly with whoever holds it.
Questions players ask
How much is Silver Icebreaker worth?
There is no stable price: trophies rarely change hands and deals happen privately. The number on value lists is symbolic.
Can you still get Silver Icebreaker?
No. It was awarded for a leaderboard place in an event and is not given out again.