Buying tactics, units, and attachment cards?

Looking at forgefire. I think I have the cards from the 2021 edition (is this technically season 3? 2?).
They sell:
1- all season 5 tactics
2- update only into season 5 (tactics + units + attachments that changed from prior season)

3- update into season 4 (tactics + units + attachments that changed from prior season)

So, one would need to buy the 3 packages, getting some redundancy/obsolete cards (from sequential season updates), and still would miss some unit cards (any non-tactics card that were not updated at season 5 or 4, but before, since they don't sell an "all season 5 cards" except for only tactics cards)?

How to navigate this?... (I am a returning player)

Edit: Forgot to mention I know the cards are on CMON website, it's just I dislike too much having bad quality prints (my print sucks), would rather pay to have nice looking cards that's all