A grade 9 Master Scroll sold on eBay for somewhere in the ballpark of $50,000 (40,000) (though it was an accepted offer, so we can't be sure of an exact price)
Most famously, the Weatherlight Saga, running from 1997-2001, had a tight correspondence between cards and story, with many of the major and, notably, loads of minor story events depicted on the cards
"Available Now: July 1"

Scene Box: The Might of Galadriel The Might of Galadriel includes the following cards: Arboreal Alliance Galadriel, Light of Valinor Rally the Galadhrim Galadriels Dismissal Mists of Lorien Galadhrim Brigade Scene Box: Aragorn at Helms Deep Aragorn at Helm's Deep includes the following cards: Anduril, Narsil Reforged Aragorn, Hornburg Hero Legolass Quick Reflexes Gimlis Reckless Might Isengard Unleashed Rohirrim Chargers Scene Box: Gandalf in the Pelennor Fields Gandalf in the Pelennor Fields includes the following cards: Olorins Searing Light Sorcerous Squall Rammas Echor, Ancient Shield Courageous Resolve Gandalf of the Secret Fire Fell Beasts Shriek Scene Box: Flight of the Witch-King Flight of the Witch-King includes the following cards: Call Forth The Tempest Nazgul Battle-Mace Witch-King, Sky Scourge Mordor of the March Fell Beast of Mordor Minas Morgul, Dark Fortress Jumpstart Volume 2 The Lord of the Rings: Tales of Middle-earth Holiday Release products include Jumpstart Vol