Just discovered this game and realized it's out of print. Luckily a local store has some of the sets in stock. Can you tell me which ones are worth getting?

Hi there, like the title says, I just discovered this game, heard so many great things about it and wanted to get it but realized that sadly the current status is out of print. By some miracle, I found a local store that has some of the content. I was surprised because this stuff is generally not available in my native language. They have mostly 2E stuff but also some of the 1E. This is what they have:

1E:

• Core set
• Lords of Winter
• Kings of the Storm
• Queen of Dragons
• Kings of the Sea

2E:

• Core set
• Wolves of the North
• Lions of Casterly Rock
• World Championship 2016 deck
• The Things We Do For Love
• Westeros Cycle (all 6 decks)
• War of the Five Kings Cycle (all 6 decks)
• Flight of Crows Cycle (all decks except The Archmaester's Key deck)
• Dance of Shadows Cycle (all 6 decks)
• King's Landing Cycle (all 6 decks)
• House Baratheon intro deck
• House Greyjoy intro deck
• House Martell intro deck
• House Tyrell intro deck
• Night’s Watch intro deck

Considering this, what is worth getting before it disappears off the face of the earth? What are the best for gameplay purposes? Which ones are just for collecting? What is the purpose of the intro decks?

Edit: I found Watchers on the Wall, House of Thorns, Sands of Dorne, and the House Lannister intro deck in other random local stores :)