As with the previous years, there are massive discounts on tech tree (and I assume collectors) tanks that can be applied from tier II through X.
Up to and including tier VI those discounts are above 50%, meaning you can apply the discount, buy the tank and sell it off again for a profit.
If you are like me and already have played most tanks in the lower tiers and do not intend to keep them, you should apply the discount on the most expensive tank in the tier to make the most credits from them.
This year the dicounts are locked behind completing daily missions and today is the day you could unlock the dicount for any tier II tank.
Here's todays price list (collectors vehicles in bold):
4100 cr. – M14/41 (IT)
3950 cr. – 7TP (P)
3900 cr. – VAE Type B (C), LT vz 35 (CZ), FCM 36 (FR), Loyd GC (GB), UC 2-pdr (GB), Chi-Ni (JP), Strv m/38 (S)
3850 cr. – R35 (FR)
3800 cr. – D1 (FR), M2 (GB), L6/40 (IT), Pvlvv fm/42 (S)
3700 cr. – T-26 (USSR)
3600 cr. – Pz I (G), Pz 35 (t) (G)
In short: apply the 100% Discount on the italian M14/41 to receive 2050 free credits.