The tank is available in-game for 6700 Gold or in bundles. This is the cheapest one, for 24€:
Day 6: T-103 – Standard (24€)
https://eu.wargaming.net/shop/wot/main/19528/
Bundle content
- VIII T-103
- Bonus 100% crew
- Garage Slot
- Bonus 25×Missions: x5 XP for a victory
Today’s mission has 
3 Large First Aid Kits as reward.
On NA, you can still get yesterday’s offer:
NA Offer – 7990 Gold or:
-
Advent WZ-120-1G FT: $35.28 (15% Off)
Bundle Contents:
-
VIII 
WZ-120-1G FT - Get
XP for the first 25 wins in the WZ-120-1G FT - 100%
Crew - 1×
Garage Slot
So for some reason the NA server gets this WZ again on the Advent Calendar? Why?
My mistake; the offer there is still yesterday’s.
We’re generally behind EU and RU regarding most things. It should update on NA in about 2 hours.
Oh okay! All good!
Congrats you will still get to swap out the WZ piece of trash for the T103 piece of trash.