There is no such thing like a "complete" BOX offer, but you can buy all parts from the IL-2 Store and actually they seem to have either extended their Autumn sale, or have just revamped the same thing again.
Right now, the sale as advertised here is active:
https://forum.il2sturmovik.com/topic/40437-autumn-sale-new-payment-system-launched/66% OFF Battle of Stalingrad
66% OFF Battle of Moscow
25% OFF Battle of Kuban
30% OFF Bf 109 G-6, Hs 129 B-2, La-5FN (Series 2), Spitfire Mk.VB Collector Planes
40% OFF Ju 52/3m and Yak-1b Collector Planes
50% OFF Fw-190 A-3, La-5 series 8, P-40E-1 and MC202 Collector Planes
50% OFF 10 Days of Autumn and Blazing Steppe historical campaigns
Battle of Bodenplatte, Flying Circus and Tank Crew are Early Access so there's no sale per se, but you get them for 10 bucks off.
It's all available here:
https://il2sturmovik.com/store/battle-of-bodenplatte/The whole pricelist looks like this (I've left out the "Standard" Editions intentionally, you will want to have the two extra planes of the "Premium" Edition, trust me):
Title Price (normal) Price (current) Savings
Battle of Stalingrad 79.99 27.19 66%
Battle of Moscow 79.99 27.19 66%
Battle of Kuban 79.99 59.99 25%
==============================================================
239.97 114.37 52%
Collector Planes Price (normal) Price (current) Savings
La-5FN series 2 19.99 13.99 30%
Bf 109 G-6 19.99 13.99 30%
Ju 52/3m G4E 24.99 14.99 40%
Yak-1b series 127 19.99 11.99 40%
==============================================================
84.96 54.96 35%
Collector Planes
included in Premium Price (normal) Price (current) Savings
Fw 190 A-3 19.99 9.99 50%
La-5 series 8 19.99 9.99 50%
P-40E-1 Kittyhawk 19.99 9.99 50%
MC.202 Series VIII 19.99 9.99 50%
Spitfire Mk.VB 19.99 13.99 30%
Hs 129 B-2 19.99 13.99 30%
==============================================================
119.94 67.94 43%
Campaigns Price (normal) Price (current) Savings
Blazing Steppe 9.99 4.99 50%
Ten Days of Autmun 9.99 4.99 50%
==============================================================
19.98 9.98 50%
Early Access Price (normal) Price (current) Savings
Battle of Bodenplatte 79.99 69.99 12.5%
Flying Circus 79.99 69.99 12.5%
Tank Crew 79.99 69.99 12.5%
==============================================================
239.97 209.97 12.5%
If you buy everything that's been fully released right now, then this sums up to 179.31$ at the moment (normal price was 344.91$, you save 48%).
If you wanna have it all, including the early access titles, you're at 389.28$ (normal price was 584.88$, you save 33%).
In your particular case, I think you own Battle of Stalingrad "Standard" already but nothing else.
So you'd need BoM Premium, BoK Premium, the "stand alone" collector planes and the two missing "Premium" planes from BoS (Fw 190 A-3 and a-5 series
.
This would be 162.12$ in total (normal price was 284.92$, you save 43%).
Mike