Available in-game for 10,200 Gold or in bundles, the cheapest being 36€:
Day 22: Somua SM – Standard (36€)
https://eu.wargaming.net/shop/wot/main/19592/
Bundle content
- VIII Somua SM
- Bonus 100% crew
- Garage Slot
- Bonus 25×missions: x5 XP for each victory
Day 22 Mission Reward: 
3 Small Boxes. Earn 2021 XP over any number of battles.
I would marry this tank!!!!!