I think you should acutally save your money for a blue or even a red mask - the green mask /santa are changing their price too often.
will take some time to get the remaining money but i think its worth it!
I dont have any intel on santas, however I do think that masks will be pretty volatile over the next few months, with multiple crashes and resurges imminent. They wont be increasing in price in a stabile manner for a while.