Just in case you have troubles trading them with others - there would be no reason you can't just have them for the regular 15 Plain Red Baubles (each - so two for 30) that they other Santas cost.
I cleaned up the list a bit to remove those that 99% of the current players wouldn't be able to relate to, to make it easier to find the new ones - but if you want any old ones in particular, you can definitely have them, no problem. Just give others a chance for a few days, and then ticket it. ;P